I have 8 attack skills that I can unlock before 80 for my daggers,
4 mastery skills to passively boost my performance in daggers,
Then I can also unlock my general Explorer skills,
such as a bonus Luck passive skill, the ability to pick/unlock treasure chests,
increased item/ely(currency) drop rate passive skills,
some unlockable passive skills for Critical & Evasion...
Then I can get an active skill called Escape that boosts my movement speed for a certain amount of time...
an attack called "Coward Stab",
and a few other things.
Then, also for Explorer, there's skills for other weapon branches:
Around 8 attack skills+mastery passive skills for both bow & crossbow
and about 12 attack skills for knuckles+mastery passive skills...
Then, I guess I'll unlock completely new branches once I advance to the next class at level 80.
I'm not too sure about other classes, because I have no interest in them.