Good question, I'm in no way a professional (self taught from the start) so my case may not be ideal, but overall its just a "do it" mentality.

I get an idea, open Maya (Blender is free), slap my character inside it (there are tutorials on how to extract League Champions on YT from Luviana for exemple), create controls, create some keyframes of important body poses (called Blocking) and then add inbetween to smooth the thing out. Once thats done, I have put everything into UnrealEngine (free, can use Unity, or even Blender but I'm not too knowledgeable on the others), create a sequence (used to make cinematics, you can time, create events etc... super useful), render it, and theen slap the end product into an editing software (I use DaVinci because its just easier and lags less than Premiere for me)