One thing that makes the Super Smash Bros. series different to traditional fighters is the airdodge. Even if you get hit by a move, you have the opportunity to throw out an airdodge and avoid your opponent’s next attack. It’s not always beneficial to airdodge, as players can exploit its recovery frames for an even harder punish — similar to frame trapping your opponent in a traditional fighter.
In their latest Smash 4 guide, the Beefy Smash Doods run through the finer points of frame-trapping, even showing how a frame trap can actually be better than using a true combo follow-up. By delaying a part of a true combo, you can even condition someone into airdodging, putting them right where you want them for a KO. So be careful with your airdodges! It may be just what your opponent is waiting for.
Source: Beefy Smash Doods