Coming back to gw2 Nord warrior help
Do you mean skill points or trait points? For skill points, you get a lot of those leveling up (and you continue to get those after you reach 80), so it is not a big deal if you messed up because eventually you’d have enough to take every single skill.
If you meant trait points, go to your trainer and ask them to reset it for you. You will have to pay a small amount of coin to do so. Each time you buy a manual (for adept at level 10, master at level 40 and grandmaster at level 60), reading it also resets the points.