Here is a list of websites that can help you learn and practice your coding skills. You can also prepare for an interview and get the chance to work for some top tech companies. In some competitions, you can win awards and get the chance to be part of their teams.
#1 HackerRank :- HackerRank serves as a technical interview platform and it also offers opportunities to practice codes and learn different techniques to over 18 million users.It allows developers to test their coding skills by competing against each other. HackerRank challenges students in a variety of fields, including algorithms, Artificial Intelligence, java, SQL, Functional Programming, Data Structures, C, Python, Databases, Regex, Mathematics, C++, Ruby, Linux Shell. HackerRank also gives users the ability to solve company-sponsored coding challenges and apply for jobs by submitting applications.
#2 codewars :- Solving coding challenges and data structures created by an online community of developers, Codewars is a great way to sharpen your coding skills. The site offers many different challenges that you can work on each one earns you a spot on the leaderboard. The higher your rank, the more difficult your challenges will be. You can view a discussion for each challenge as well as user solutions.
#3 Topcoder :-TopCoder is a site where designers, developers, data scientists and competitive programmers can build their skills, show their expertise and earn money as they improve their coding abilities. Corporate clients use TopCoder to hire freelancers on-demand; the site also sets challenges for the coding community and hosts competitions designed to highlight top coding talent worldwide. Customers use TopCoder to hire freelancers on-demand; the site also sets challenges for the coding community and hosts competitions designed to highlight top coding talent worldwide.
#4 LeetCode :- LeetCode is the best platform to help you become a more proficient developer by practicing coding problems and preparing for technical interviews. The site has over 2,450 questions in 14 different programming languages, covering many different concepts. At its core, LeetCode is geared toward developers.
#5 HackerEarth :- HackerEarth is one of the best coding challenge websites that features more than 8000 questions, 10,000+ challenges, and 1000+ hackathons. It has a thriving community of 4 million developers. You can see your progress with the help of a developer assessment software, and the website shows the days left in competitions and contests. There is also a remote interview feature plus analytics for companies to see your statistics. Currently, more than 750 customers worldwide use its technical coding assessments platform—including Amazon, Walmart Labs, Thoughtworks, Societe Generale, HP, VMware, DBS, HCL, GE, Wipro, Barclays, Pitney Bowes, Intel, and L&T Infotech .
#6 CodeChef :- Code-Chef is an online educational program and competitive programming community of global programmers. Directi, an Indian software company, started Code-Chef in 2009 as an educational initiative to help. In 2020, it became owned by Unacademy. Code-Chef helps programmers elevate their skills in the world of algorithms, programming, and contests with a huge community of problem curators; it promotes a culture of learning and friendly programming with a huge range of features that make it one of the best coding challenge websites. It hosts India regionals of the ICPC for college students as well as International Olympiads for school students in India. Most parts of Code-Chef are available without charge but more advanced features require a monthly subscription.
#7 Kaggle :- Kaggle is a social platform that provides data scientists with a community of other data scientists. The company provides micro-courses designed to practical skills for data science professionals. Courses available include: Python, Pandas, SQL and Data Visualization. Inside Kaggle you'll find all the code & data you need to do your data science work. Use over 50,000 public datasets and 400,000 public notebooks to conquer any analysis in no time.
#8 Code Jam :- Code Jam is Google’s global coding competition.It is an annual competition in which programmers of all levels put their skills to the test. Participants must work through a series of algorithmic puzzles to win a spot in the World Finals for a chance to be the champion and win a $15,000 prize. To get more information visit official website.
#9 spoj :- Sphere Online Judge (SPOJ), a free online programming competition, trains users to code and build efficient algorithms through more than 20,000 practice problems and more than 315,000 registered users. Scoring categories for problems include challenges, tutorials, and riddles. Rankings and a status board accompany running contests that support more than 45 programming languages and compilers. SPOJ offers a flexible testing system to automatically assess user-submitted programs. Users can design their own contests or take part in an online course at all programming levels if they wish; however, it is ideal for students.
#10 SoloLearn :- SoloLearn is great place to learn programming. It has a thriving community of 39 million learners with 1784 lessons and 14000 quizzes. One of the most amazing thing about that all courses are free, on the website and app. It's good for beginners who want to start journey of coding. Courses that you can learn on SoloLearn are Python core,Ruby, C++, Java,PHP, Go,C, C#, Web Development Fundamentals , JavaScript, HTML, Css, Game Development with JS, Responsive Web Design, SQL, R, Data Science, Machine Learning and many more.
#11 CodeSignal :- CodeSignal helps you get ready for technical interviews by helping you complete real-world assessments in an advanced IDE. It starts with customizing a personal study plan and then guides you through key topics by solving real-world problems. It helps you practice and get the core concepts that are asked in technical interviews. It also helps you understand your strengths and weaknesses.
#12 Exercism :- Exercism is a platform for learning and practicing coding. It has 3,173 exercises across 61 languages to level up your programming skills, and it offers an engaging environment with its dedicated team of mentors and enthusiastic members. The best part is it’s 100% free forever. Visit official website to get for information.
#13 Codeforces :- Codeforces is one of the best platforms for competitive programming contests. Here you can practice problems from very beginner level to very advanced level. It is great for programmers who seek for fun challenges to build up their skills and join groups that suit their needs. It has a Gym feature that is very unique where you can train your skills. They organize approximately six contests every month participating in them is free.
#14 Codecademy :- is an online platform that offers free coding classes in 12 different programming languages, including Python, Java, Go, JavaScript and Ruby. you can enroll in 180 interactive basic courses for free and also get Pro subscription to access 1,800 courses with step-by-step guidance and get personalized learning plans and realistic projects. It has over 50 million learners worldwide.
#15 DataCamp :- DataCamp is a popular vendor for learning data science using Python and R. It offers both free and paid versions of its platform, with the free version allowing you to access the first chapter of most courses, while the paid version provides access to over 300 courses with projects and more.
#16 FreeCodeCamp :- FreeCodeCamp is a not-for-profit organization. This gives beginners a chance to learn and practice coding on their own time and save money. The organization offers many resources for learning that are free, including some fun challenges to sharpen your skills and prepare you for interviews.
#17 CodinGame :- CodinGame is a platform where learners learn to code in an engaging and fun way, it provides them with a lot of challenging problems that help them to hone their problem-solving skills. Here learners can learn, practice and compete and contributing .
#18 Project Euler :- Project Euler is also an online platform for practicing coding. They offer a large number of computer science and math related challenges. The Euler project problems are very good, you need a strong programming brain to solve them. The Euler Project has over 1 million users who have solved at least one problem in over 100 different programming languages. This is a non-commercial website, so all content on this website is free to use. If you want to challenge and sharpen your logical mind, try it now.
#19 GeeksForGeeks :- GeeksForGeeks is one of the most used websites by programmers. Knowledge has no limits. They offer a variety of services to learn in a very interesting way. Free tutorials, millions of articles, frequent coding contests, webinars from industry experts, training and job opportunities. Content on the platform is free but with premium features,you get access doubt assistance and ad-free content.
#20 GitHub :- Last but not least, GitHub is the best software development platform in the world. It is a cloud version control system. This is an open source community with over 500 free programming books covering over 80 different programming languages. On GitHub, developers store and public their own projects.