That's a lot of speculation and I don't agree with all of it.
I don't think skills work like that. with 400+ abilities, I don't think they'll be spread over just 12 catagories. We already know there will be multiple magic schools, divine magic schools, unarmed, etc.
Intelligence = purple bar (magic damage, Mana regen)
Intelligence might be blue, due to mana often being blue in games.
underneath money is inventory space so i think maybe constitution skill tree contributes to carry space...
That might be weight, because the inventory system will work like in Diablo and Path of Exile, so items will take up physical space and it's up to the player to move items around to fit as much as possible. Weight will certainly affect what you can carry aswell according to the link below, but inventory won't work like in WoW where every item takes up 1 slot.
https://forum.fracturedmmo.com/topic/376/feature-spotlight-2-universe-planets-and-travels/49
top left of skill tree we can see 24/60 points unlocked (which makes me think lvl 60 is max lvl) and 24 points assigned (which makes me think it costs 2 for each skill point)
I think it's:
Points unlocked: Amount of points unlocked / point cap.
Points assigned: amount of points assigned / amount of points unlocked.
unlock skill point! 1000KP? (KP = Kill points most likely shown at top right with the book)
KP = Knowledge Point. Don't call them kill points, because knowledge is gained from more than just killing.