At low percent you want Dthrow, Fthrow, Utilt, Dancing Blade, and edgeguard early kills (on certain characters).
At mid percent it depends on the character but DB, shield breaks, Dthrow, aerial strings, getting them offstage, and short hop Fair and Bair into missed tech Tipper Fsmash punishes are all good.
At high percent you want Tipper aerial kills, Tipper Ftilt, Uthrow, Dolphin Slash out of shield, certain Dancing Blade kill setups depending on character, Dtilt into tech-chase Usmash or DS, and to favor ledge traps over edgeguarding.
At every percent you want Jab 1.
*Your Rage will decide what counts as a low, mid, or high percent.