For tilt and dash attacks (Hold down /// in the direction that you tap- after you tap, hold it down to keep running, and then press /// to execute a dash attack).
Having the same name of the game, smash attacks are powerful attacks that are very useful. They are not the more powerful of attacks for some characters, but they certainly have launching power. To execute a smash attack, you must press and hold down /// and /// simultaneously, or use +//.