SP

Skill points or SP are an equivalent of experience points or XP in most other games.

It represents how far you are in-game and offers a sense of reward when certain actions are performed such as:
 * killing/intimidating enemies
 * killing animals
 * taming horses
 * gathering (? not sure about this one tho)
 * crafting
 * completing quests
 * your warriors kill enemies

You will be able to use SP for different things such as:


 * unlocking skills
 * unlocking craftingrecipes (weapon recipes are only lootable; you need to find these instead of unlocking with SP)
 * buying warpaints

Keep in mind that when you die, you lose half of your SP. So best to time your risky moves when you're low on SP.

TIP: take a good look at all available skills before you start unlocking: for every skill you unlock the others become more expensive.