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Free online Indian stock brokerage & STT calculator. Calculate exact STT, GST, SEBI turnover fees, stamp duty, breakeven points, and net P&L across brokers.

Complete guide to Indian stock market transaction charges: STT rates, exchange transaction fees, SEBI turnover fees, stamp duty, GST, and zero-brokerage math.

Instant, simple, client-side interactive FIRE calculator. Calculate your target FIRE number, years to financial freedom, and projected retirement date.

Demystify the FIRE movement. Learn the 25x rule, the 4% Safe Withdrawal Rate from the Trinity Study, Lean vs Fat vs Coast FIRE, and the math to retire early.

Comprehensive benchmark and architectural comparison between G1GC and Generational ZGC in modern Java. Understand pause times, colored pointers, load barriers, and throughput trade-offs.

Comprehensive deep dive into the JVM JIT compiler. Understand Tiered Compilation (Levels 0–4), Escape Analysis, Scalar Replacement, and Inlining with runnable benchmarks.

Learn how to stream real-time tick-by-tick stock market data using Shoonya (Finvasia) WebSocket API in Java. Step-by-step tutorial covering the NorenWSAPI protocol, handshake authentication, avoiding policy violations, and building an auto-reconnecting client.

A comprehensive beginner's guide to algorithmic trading in the Indian stock market. Learn how algo trading works, set up Shoonya (Finvasia) zero-brokerage APIs, fix common network traps, and deploy risk-controlled paper trading strategies.

Generate 100% free, private, permanent QR codes online from text, URLs, Wi-Fi passwords, UPI payments, and emails. No signup required, no subscription fees, no scan limits, and no expiring redirect links.

Deep technical guide to QR code internals: matrix anatomy, 2D scanning physics, Reed-Solomon error correction algebra, and complete Java ZXing implementation.

Learn how to authenticate with Shoonya (Finvasia) Trading API in pure Java. Step-by-step guide covering the modern OAuth 2.0 GenAcsTok flow, SHA-256 checksums, IPv6 network fixes, and live WebSocket streaming with accesstoken.

Comprehensive comparison of the best algorithmic trading APIs in India: Shoonya, Zerodha Kite Connect, Angel One SmartAPI, Upstox v2, DhanHQ, and Fyers. Detailed analysis of API pricing, brokerage, rate limits, SDKs, WebSocket streaming, and pros & cons.

Convert JSON payloads into modern Java 17/21/25 Records or Lombok DTOs online. Automatic type inference, nested records, and Jackson @JsonProperty annotations.

Free online Cron Expression Generator and Spring Boot @Scheduled simulator. Translate cron to plain English, preview next 5 execution times, and copy production code.

Free online regular expression tester and Java 21+ Pattern snippet generator. Live match highlighting, capture group debugging, and instant Java string escaping.

Free online JSON formatter, beautifier, minifier, and syntax validator. Format JSON with 2-space, 4-space, or tab indentation with 100% client-side privacy.

Free online URL encoder and decoder tool. Encode URI components, decode query strings, parse URL anatomy, and inspect query parameter tables with 100% privacy.

Consistency, Availability, Partition Tolerance. Learn the golden rule of distributed systems and why you can only choose two.

Learn how to use Message Queues to handle heavy background tasks asynchronously without making your users wait.

When your single database hits 100% CPU, panic sets in. Learn how to scale your databases horizontally using Replication and Sharding.

Why query your database 10,000 times a second for the same data? Learn how Caching and CDNs drastically speed up your applications.

Understand the great architecture debate. Learn why Monoliths are great for startups and when it's time to break them into Microservices.

Motivation is a myth. Systems are reality. Learn how to build compounding, 1% improvements into your software engineering career using Atomic Habits.

Why do PR comments sometimes feel like personal attacks? Let's explore the cognitive biases that ruin Code Reviews and how to fix them.

Discover the psychology behind the 'Flow State' and learn practical techniques to enter the zone, write better code, and block out the noise.

Feeling like a fraud? You're not alone. Let's break down Imposter Syndrome in software engineering with a humorous, actionable guide.

Discover the Trie, a specialised tree for string operations. Learn how Auto-Complete works and how to search a dictionary of words in O(L) time.

The crown jewel of pathfinding. Learn how A* combines Dijkstra's guaranteed accuracy with a Greedy Best-First Search heuristic to find the shortest path lightning-fast.

Zoom down to the 1s and 0s. Master Bitwise AND, OR, XOR, and Shifts to solve problems with brutal efficiency and zero memory overhead.

Demystify Recursion. Learn how functions call themselves, how the Call Stack unwinds, and the difference between Head Recursion and Tail Recursion.

Learn how to solve Sudoku, N-Queens, and combination puzzles using Backtracking. We cover the core template that solves almost all combinatorial search problems.

Why look at the big picture when you can just make the best immediate choice? Learn when Greedy Algorithms work, and more importantly, when they fail.

Master Bottom-Up Dynamic Programming. Learn how to replace recursive Memoization with iterative Tabulation to eliminate StackOverflows and optimise memory.

Unlock the power of Top-Down Dynamic Programming. Learn how Memoization turns slow $O(2^n)$ recursive algorithms into lightning-fast $O(n)$ solutions.

Master Dijkstra's algorithm to find the absolute shortest path on weighted graphs. Learn how it combines BFS and a Priority Queue to work its magic.

Master Depth-First Search for graphs. Learn how to implement DFS recursively and iteratively to detect cycles, find connected components, and solve mazes.

Enter the world of Graphs. Learn how to represent graphs using Adjacency Lists and Matrices, and master Breadth-First Search (BFS) to find the shortest paths.

Master Heaps and Priority Queues. Discover how an array can represent a perfect binary tree, and how to get the maximum or minimum element in O(1) time.

Learn how Binary Search Trees achieve O(log n) lookups by enforcing strict ordering rules. Includes Java implementation of insert, search, and delete operations.

Discover the anatomy of Binary Trees. Learn the four main traversal methods (In-order, Pre-order, Post-order, Level-order) with clear diagrams and Java code.

Everything you need to know about Linked Lists. Learn how nodes connect via pointers, difference between Singly and Doubly linked lists, and Java implementation.

Understand the magic behind O(1) lookups. We explain Hash Tables, Hash Functions, and collision resolution techniques with Java's HashMap.

Learn the core concepts of Stacks (LIFO) and Queues (FIFO). Understand their operations, time complexities, and see them implemented in Java using Deque.

Master the Sliding Window technique to solve contiguous sub-array and sub-string problems efficiently. Covers fixed-size and dynamic window patterns with Java examples.

Learn the Two Pointer technique to solve array and string problems efficiently. Covers opposite-direction and same-direction patterns with Java examples.

Master the two fundamental search algorithms. From the brute-force scan of Linear Search to the elegant halving strategy of Binary Search, with Java code and traced examples.

Break the O(n log n) barrier with linear-time sorting algorithms. Learn how Counting Sort, Radix Sort, and Bucket Sort work with detailed examples and Java code.

Discover how Quick Sort partitions arrays around a pivot to achieve O(n log n) average performance in-place. Full Java code, traced example, and pivot strategy discussion.

Master Merge Sort with a visual divide-and-conquer walkthrough, complete Java implementation, and a deep dive into why it guarantees O(n log n) performance.

Understand Selection Sort and Insertion Sort with intuitive analogies, traced examples, Java code, and a side-by-side comparison of when to use each.

Learn how Bubble Sort works with a detailed step-by-step walkthrough, Java implementation, and Big-O analysis. The easiest sorting algorithm to understand for beginners.

Learn what algorithms are, why they matter, and how Big-O notation helps us measure their efficiency. Includes easy-to-follow examples, Java code, and a complexity cheat sheet.

A complete, beginner-friendly guide to algorithms and data structures. Learn sorting, searching, trees, graphs, dynamic programming, and more — with Java examples.

Master the thread-safe and intuitive java.time API introduced in Java 8. Learn how to handle dates, times, and time zones correctly.

Stop chasing NullPointerExceptions. Learn how to use Java 8's Optional class to build safer, more resilient applications.

Learn how to process data declaratively with the Java 8 Streams API. Master filter, map, and collect to write cleaner loops.

Deep dive into Java 8's interface enhancements. Learn about Default Methods, Functional Interfaces, and the foundational built-in functions like Predicate, Consumer, Supplier, and Function.

Master Lambda Expressions in Java 8. Learn how to write concise, functional code and eliminate anonymous inner class boilerplate.

Revisit the revolutionary changes introduced in Java 8, the release that brought functional programming to Java with Lambdas, Streams, and the Optional API.

Explore the smaller but impactful features of Java 11, including Predicate.not(), simpler Collection to Array conversion, and single-file execution.

Understand how to use the 'var' keyword in lambda expressions in Java 11 and why it's useful for annotations.

Discover the new utility methods in String and Files classes introduced in Java 11. Write cleaner code for common text and I/O tasks.

Master the modern HTTP Client in Java 11. Learn how to perform synchronous and asynchronous requests with support for HTTP/2.

Explore the landmark features introduced in Java 11 LTS, including the new HTTP Client, Local-Variable Syntax for Lambda Parameters, and key String and File API enhancements.

Explore Java 17's new random number generator interfaces and algorithms for better performance and flexibility.

Eliminate boilerplate with Records in Java 17 - the perfect solution for immutable data carrier classes.

Write cleaner multi-line strings in Java 17 with Text Blocks, perfect for JSON, SQL, HTML, and more.

Simplify type checking and casting in Java 17 with Pattern Matching for instanceof, eliminating boilerplate code.

Master Sealed Classes in Java 17 to control inheritance hierarchies and build more maintainable, secure domain models.

Explore the powerful features introduced in Java 17 LTS, including Sealed Classes, Pattern Matching, Text Blocks, Records, and enhanced random number generators.

Java 25 extends pattern matching to primitive types like int and long, unifying the type system.

Say goodbye to import clutter with Module Import Declarations in Java 25.

Flexible Constructor Bodies in Java 25 allow statements before super(), giving you more control over object initialization.

Java 25 introduces Compact Source Files to reduce boilerplate and make the language more beginner-friendly.

A comprehensive overview of the new features in Java 25, including Compact Source Files, Flexible Constructors, and Primitive Patterns.

Discover how Unnamed Patterns (_) in Java 21 help you write cleaner code by ignoring unused variables.

Explore Structured Concurrency in Java 21 for more robust, readable, and maintainable concurrent code.

Simplify your Java learning layout with Unnamed Classes and Instance Main Methods in Java 21.

Pattern Matching for switch in Java 21 revolutionizes control flow with type testing and complex case logic.

Learn how Record Patterns in Java 21 allow for powerful and concise data navigation and processing.

Sequenced Collections introduced in Java 21

Virtual Threads NOTE: This is a preview feature NOT enabled by-default in JDK-21.

String Templates introduced in Java 21

All new features introduced in Java 21

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