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Here's the classic. Pretty much everyone knows about LeetCode's platform nowadays, and for good reason. It's an expansive library of over 2500 questions grouped into topic-specific lists. Mainly used for interview preparation, it's also a good platform to just spend time working through problems for the sheer knowledge about problem-solving and DSA you'll learn.
I really enjoy Advent of Code. The platform is laid out really well, and I love the style of the whole thing. The challenges are all Christmas-themed, which is super unique and contributes a lot to the feel of the website.