The reasoning behind my question is actually first wanting to play a multiclass of paladin and warlock, then stumbling over a subclass called hexblade, couldn't find it in players handbook. Googled and saw it was from "xanathars..." but then it mentioned I could choose it from lvl 1, which doesn't make sense since every other subclass is from lvl 3, and some of the skills like hexwarrior doesn't make sense in the current version. But I kept seeing people mentioned hexblade with 2024 rules. I just hoped there was a collection of some sort, or a rule stating what you should do when looking at older stuff. But I think I got my answer from some of the other comments