HIT skill - is an active skill wherein you deal 2x your damage to an enemy/monster.
ALERT skill - this passive skill raises the amount of resistance in all states.
There are also other skills such as:
Courage - this buff enhances your ability to attack
Healing - self explanatory. Also an active skill
As for the rest of the skills, well that will depend what school you're going to enter. I will update you guys on that. Hope this helps. Thank you.