Well, I like to RAR neutral air, and hit with the back part of it. If your opponent is expecting the b-air and side dodges or blocks early, you nail them. You then get a free b-air at lower damages. Sometimes, you can even get an upward angled f-tilt after the b-air.
As for getting back from the edge, I like to drop down, Aether, then drop, second jump immediately, and air dodge. The air dodge cancels on the ground, and you can do a bunch of stuff after words. Like, roll, grab, shield drop jab. Fun stuff.