Certain books, traits and perks give the player a skill point bonus for a specific skill as well.
The number of attainable skill points (without books, and not including what your skills are at character creation or your tagged skills) is 428. Combined with the Comprehension perk and every Vault Boy Bobblehead, you can achieve a 100% stat in ALL of the skills, though it might take some time searching the wasteland for everything.
Skill points are used to buy skills from skill trainers. Each skill costs one skill point and a certain amount of money. The first skill purchased costs 50 , and the price increases gradually up to a cap of 1 on the 20th skill.
The total number of unredeemed skill points is listed in the hero panel.
A character acquires skill points in the following ways:
Although 261 skill points can be earned from missions and quests, the maximum a single character can earn (from them) depends on their starting Campaign: Prophecies: 253 points, Factions: 252 points, and Nightfall: 244 points.
You can also earn unlimited skill points through gaining experience.