This is usually covered in the character sections, with guides listing combos by character.
I don't know much about this game, but a few I've seen:
- Thunder Barret to Blasting Zone (a strict combo IIRC though the window is very narrow)
- Paladin Arts/Searchlight to Paladin Force (link glitch, far more common than Saint's Fall)
- Shadow Flare to Heaven's Light (common)
- Attack System to Sector Ray/Cosmic Ray (the latter is a link glitch I am unfamiliar with)
- WWF to Trine (common)
- Stun to Stone/Aero (not a strict combo?)
- Sticky Bomb to Satellite Laser
- Thunder Crest to Dreary Cell, Dynamite to Flare (rare)
Terra has loads of link glitches, although the one I am most familiar with is Meltdown with Holy out to Flare and Ultima.