Need help with a new character

Well, I was watching a build video and noticed the guy’s skill tree and saw that he had certain skills without getting the previous one. How do I do that?

Each level usually has 2 “perks”. If you spend 10 skill points on 1 level in a skill tree, it will open the next 2 levels down.

You can check you skills online Here and you will know exactly what level you need to be to open a specific skill.