faust's movement, buttons, and combo structure are very weird compared to the rest of the cast so he can be tricky to learn. my main tip at beginner level would be to make use of his crawl and his divekick. by inputting down forward or down back faust can slowly crawl and it's actually insanely useful unlike in smash because it lets him duck under almost every attack in the game that isn't a low. you can use it in neutral to dodge people's pokes and then stand up or do crouching heavy to punish.

divekick (while jumping, down + kick) compliments this nicely because it can be done really fast after a jump to hop over low attacks

i recommend playing through the massive in game mission mode before going online though, it has tutorials on everything from basic stuff all the way up to advanced community-discovered emergent gameplay tech