2XKO is still relatively new, but the community is already hard at work creating new resources for those who want to learn the game. One of the most recent among them is 2XKOMBO, a website dedicated to sharing combos for both individual characters and every character pairing imaginable.
It's already looking like quite a solid way to both share and fine combos. You have a handy filter to select your characters, get quick notes from the author, and see tags that tell you how many resources the combo requires or what sort of positioning it requires.
So far most of the submissions are just combos, but there's also room for blockstrings, punishes, mixups, setplay, and neutral or defense situations. It's worth keeping an eye on this, because if this website does take off, it could become a genuinely great resource for learning new characters or picking up on nuanced situations.
And aside from this functionality, they already have the foundation for tracking character winrates, player profiles, and tournaments. Much of this is currently very bare bones, but as mentioned before, it's incredibly promising.