Maybe it's not cheating, not entirely. It's really just finding a way to take advantage in a world with endless possibilities.
In this video QuebecGaming1 walks us through a fairly easy way to level up your archery to 50 without having to spend a single septim. It involves recruiting a specific non-player character in Riverwood. I'll let the video explain in more detail.
Here's how you can find that NPC and get him to join you as a companion.