The F.L.U.D.D. is a very good tool both for edgeguarding and spacing. Most commonly used for edgeguarding is the Superman combo which is simply F.L.U.D.D. to cape (Push your opponent away from the ledge with the F.L.U.D.D. and then push them even further with the cape; this can be done multiple times consecutively); time the F.L.U.D.D. and try to use it to stop the momentum of their second jump, use it when they're put into helpless from their final recovery move, or position them for an attack. The F.L.U.D.D. is also good for spacing and diverting attacks such as smash attacks or aerials (You can use the F.L.U.D.D. to divert your opponent’s aerials when you're being edgeguarded and push your opponent away from the ledge). The F.L.U.D.D. is very good because it can't reflected (For the exception of Mario's cape), it can't truly be blocked, and other reflectors simply negate the pushback temporarily.
*Try to use F.L.U.D.D. at a bit of a range since its startup is a little slow*
*Remember to aim for the tip of the head for maximum pushback*