How to: ⚔️  Competitive programming
- [Topic Wise Problem For Competitive Programmer](https://a2oj.com/categories) : Topic wise Practise Problem
- [Advent of Code](https://adventofcode.com) : An Advent calendar of small programming puzzles
- [Archived Problems - Project Euler](https://projecteuler.net/archives) : Problems Archives
- [Art of Problem Solving](https://artofproblemsolving.com) : Is math class too easy for you? You've come to the right place!
- [AtCoder](https://atcoder.jp/) : One of the best places to build competitive programming skills for beginners to experts.
- [CodeChef](https://www.codechef.com) : The only programming contests Web 2.0 platform
- [CodeSignal](https://app.codesignal.com) : Test your coding skills
- [CodeEval](https://www.codeeval.dev/) : Notepad for notes and code snippets, stored locally in the browser
- [Codeforces](http://codeforces.com) : Programming Competition,Programming Contest,Online Computer Programming
- [Codewars](https://www.codewars.com) : Rank up by completing code kata
- [Codility](https://codility.com) : Verify and improve coding skills
- [Codingame](https://www.codingame.com/start) : Learn coding through games and challenges!
- [Facebook Hacker Cup](https://www.facebook.com/hackercup/) : Facebook's Programming Contest, past problems solutions and FAQ
- [Google Coding Competitions Archive](https://zibada.guru/gcj/) : past contest problems for practice
- [HackerEarth - Programming challenges and Developer jobs](https://www.hackerearth.com)
- [HackerRank](https://www.hackerrank.com) : Practice coding. Compete. Find jobs.
- [LightOJ](https://lightoj.com) : Practicing at lightoj is so good for beginners as it is categorized and have also chat room and forum which helps to communicate with others about any problem.
- [PKU ACM ICPC Practice problems](http://poj.org/problemlist) : Judge online for ACMACPC
- [Sphere Online Judge (SPOJ)](http://www.spoj.com) : Become a true programming master Learn how to code and build efficient algorithms
- [Topcoder](https://www.topcoder.com) : Deliver Faster through Crowdsourcing
- [URI Online Judge](https://www.urionlinejudge.com.br/judge/en/register) : Practice coding, Compete and be a better coder.
- [UVa Online Judge](https://uva.onlinejudge.org) : hundreds of problems supporting multiple languages.
- [WakaTime](https://wakatime.com) : leaderboards of coding metrics collected via editor plugins
- [PrepBytes](https://mycode.prepbytes.com/competitive-coding/practice) : Topic and level wise proper arrange problems 
- [A2OJ Ladders](https://a2oj.com/Ladders.html) : Practice codeforces problems based on your proficiency and difficulty
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