I heard that you shouldn't try to increase skills unnaturally in skyrim, for example leveling up smithing to 100 right away. So how do you recommend leveing it accordingly so that I don't mess up my character build?
I'm also playing master difficulty which is why I ask, my bow is way to weak, it's the ancient nord bow.
If you level anything excessively with a trainer, you should only do either combat or defensive skills (unless you've got those maxed already, of course). If you power level something like smithing, for example, your character level will go up, making the game harder, but your character will still be weak because you haven't leveled any comabt or defensive skills.
If you've already got relatively good combat and defensive skills, leveling the other skills will be fine.