@Xbob42I'm not sure if there's any way to see what they do in game. Mostly I've just been trying stuff out. But this is from the manual.
Techniques
Following are some of the Techniques your characters will learn. Some are reserved for battle only, while others can be used in Camp. All Techniques take up a character's TP, and the more powerful the Technique, the more TP is used. A Technique might not work in battle against a certain type of enemy or defense, but the TP is used up anyway.
Battle Techniques:
Affect one enemy on screen:
Foi, Gifoi, Nafoi blast the enemy with a bolt of flame.
Wat, Giwat, Nawat freeze the enemy by dropping the temperature of the surrounding area.
Vol kills the enemy by destroying its nervous system.
Tsu, Githu, Nathu fires an arrow of light at the enemy.
Affect all enemies on screen:
Zan, Gizan, Nazan suffocate enemies by turning the surrounding area into a vacuum.
Gra, Gigra, Nagra crushes enemies with a powerful gravity well.
Megid disintegrates the molecular structure of all enemies on screen.
Bolt kills enemies by destroying their nervous systems.
Gelun causes enemies to age quickly and reduces attack strength.
Doran slows down enemy reaction speed.
Brose suddenly expands enemy body mass to twice the normal size, resulting in damage.
Rimit interferes with enemy nervous systems, resulting in unconsciousness.
Boost Techniques: Use these Techniques to boost the abilities of your characters while they are in battle. These Techniques do not boost character HP.
Shift increases the physical attack strength of one active character.
Saner increases the reaction speed of all active characters.
Deban creates a shield before all active characters, increasing their defensive strength.
Healing/Restorative Techniques:
Sar restores some HP to all active humanoid characters.
Res, Gires, Nares restore some HP to one active humanoid character.
Anti cures one active character of poisoning, but does not raise HP.
Rimpa cures one active character of paralysis, but does not raise HP.
Arows revives one active character who has been knocked unconscious, but does not raise HP.
Rever revives one flatlined character and restores 1/4 of total HP.
Regen cures poisoning, unconsciousness or paralysis, or restores all HP to one flatlined character.
Travelling Techniques:
Ryuka teleports all characters to any city previously visited.
Hinas teleports all characters out of dangerous areas such as dungeons or labyrinths.