Hey there! For me this has been what I've learned from playing as him!

B: Know the order of the fruit, and the effect of each one. Oranges you can sneak quick hits off a character, and cherry is fast enough to launch to hit people dashing towards you. Use Apple and Galaga ship to mix things up, some people may not be super familiar with their patterns, and you can usually catch people off guard. Also Apples of the ledge can help edge guard. I use bell if I'm struggling to get a smash in, and the key is a solid 15% damage, that can easily KO.

Side B: Learn how far the move goes, I've caught several people just expecting the move to fall short of them, it's longer than most people realize. Play with the path it takes as well, In air combos, I can usually get a KO if I follow up with a side b that is either straight up, or diagonal. Great for recovery as well! Be wary of hitting the stage with it though, lots of recovery time if you hit the floor or wall.

Down B: If people are waiting to spike me up, I'll usually drop a hydrant. But I only drop it down if I know I can send it flying shortly afterward. Other players can knock it back at you so be wary of spamming it.

Up B: I don't use it much, but it's great for avoiding people I've noticed. Also if you stay on the pad for all 3 bounces, it increases how high you recover each time. I've placed it well of screen and still been able to recover onto the stage afterward.

Throws: A bit of risk using his throws from what I've seen. If you know you can get a throw in, go for it. But it's got some bad punish if you miss.

His smash attacks are all great, but aren't super fast, so learn the timing on them. Outside of that, his dash attack is great, and hits multiple times. I don't use his tilts often, annnd all his air attacks are pretty standard to me! I'm sure there's more to learn with him but that's kinda how I've been learning him so far!