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If you are a beginner programmer, I'd highly recommend that you start at here. Difficuly of the problems are specified in kata from 8-kata to 1-kata which is from the easiest to the hardest. You can choose to use your programming language to solve each coding challenge. So If I were to start anew and wanted to solve coding problems, then I'd start at 8-kata and solve 20-30 coding problems at each kata before moving on to next kata. Codewars
LeetCode became really famous in the recent years as they provide problems that encountered in real coding interviews in companies ranging from Google, Meta, Netflix and more. They've both free and paid version of the platform. Paid version provides more features such as being able to view solution to the most encountered coding problems in interviews. You can choose to solve coding problems in your favourite programming language. Problems are ranked from easy, medium, and hard but don't think that because problems are specified as easy it does not mean they are easy. In fact even easy problems are quite hard, so it's not recommended for complete beginners. I'd recommend first to do coding problems in codewars, or edabit. And they also have challenges not only on programming but also in SQL as well. LeetCode
Exercising is quite uniqie among other platforms as they not only provide coding problems in 60 programming languages but also mentors who helps you find gap in your knowledge and helps you become better problem solver and programmer. I'd highly recommend Exercism for developers who are anywhere from intermediate to advanced level Exercism