1. HackerRank :
HackerRank is most popular platform of coding. It is most used by beginner. It is also made for beginners. If You are beginner you can start coding on Hackerrank. On this platform you can find courses of programming subject . Most helpful course is "Problem solving skill". which is also known for "Data structure and algorithm."
2. CodeChef:
Codechef is most popular platform for coding. It is also used by beginner and competitive coder. It is most popular for short duration coding events and long coding challenges. You can boost your problem solving skills.
3. Codeforces :
Codeforces is most popular platform for competitive coding. It is mostly used by competitive coder. You can start your journey of competitive coding with codeforces. It is mostly popular for short term coding competition and regularly 3 coding competition per week , which make it popular and useful.
4 . Topcoder :
It is most similar to codeforces. It is also popular for competitive coding . It is mostly used by competitive coder. Here you can find contest and article related to topics. which is really helpful.
5. Atcoder :
It is most similar to codeforces. It is also popular for competitive coding . It is mostly used by competitive coder. Here you can find contest and article related to topics. which is really helpful.
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