Knowing when to use which one is really hard to distinguish at the beginning and is largely MU based/if you want to pursue them or not/if you're zoning. It's annoying.
As for other things you need to learn, when to pursue people, when it's best to just reset to neutral, trapping landings, platform pressure, zones of safety (super important), and my favorite part of the game- ledge trapping your opponent (super important).
As for other things you need to learn, when to pursue people, when it's best to just reset to neutral, trapping landings, platform pressure, zones of safety (super important), and my favorite part of the game- ledge trapping your opponent (super important).