The best advice I can give you is to join the respective class Discord server for the information you're looking for. Ask veteran players, join a guild, make friends, etc. This game heavily rewards players who figure things out for themselves; it's in your best interest to take a hands-on approach when learning the class you choose as your main. Read your skills, understand what they do, try different combinations to figure out which animations cancel others.
Sorry I can't be of more help. Since each class has 30+ skills that all interact in different ways and have unique animations/properties, you'll be hard-pressed to learn each class early on. Focus on a main.