That's like only the beginning.

Skill points, depends on which weapons you preferred but for me, I'll try to go for dual-welding, strength, weapon+ for fighters, magic might for caster, magic mending for healer; and ya, limited becoz when reached Level 99, will still be short of some skill points.

Can't remember now, but each fighters got one or two skills that can deal more damage, not all skills do ... can't really guess from the description, have to try.  (Will edit this when got more free time later)

But if you're gonna farm skill seeds, then won't be problem which skills to open first.

Jade multithrust
Erik divide, envenomed and the one skill deal more dmg to poison enemies....

One problem with googling guides before almost finishing the game ... there'll be spoilers which will minimize your enjoyment/surprise of the storyline ...

So, don't worry about trial and error/experimenting with which skills to open first ... you can always spend gold to undo the branch of skills (will cost a lot depending on how many already opened), but gold always easier to farm.