This useful technique apparently allows your Skyrim character to get trained to a high level in the Archery skill and consequentially gain several character levels and perks at almost the very beginning of the game, all without losing any gold whatsoever…
Got to the town of Riverwood and do the side quest about a love triangle between Sven, Faendal and Camilla. If you help Faendal, he’ll become available as your follower.
If you find yourself not wanting to help Faendal because you think that what he asks of you is underhanded and unbecoming the type of character you want to play, you can achieve the same outcome by going to Sven and accepting the same task from him, but then doing the other available course of action, which undoes Sven’s scheme and earns you the gratitude of Faendal and Camilla, and makes Faendal available as your follower.
Faendal is able to train your character to be better in the Archery skill. Buy all five sessions of training (you can only buy five training sessions per character level), then speak to him and say you need to access his inventory (the “I want to trade some things with you” follower dialogue option). You’ll find that whatever sum of gold you paid to him for the training will be in his inventory, and you can just take it all right back.
Each time you gain a character level, buy another five sessions of Archery training from Faendal and do exactly the same thing with the gold in his inventory, and you’ll soon develop your Archery skill to a high level, especially as you gain character levels quiet quickly in the early game if you advance skills through training sessions. Remember, however, that Faendal is only a Journeyman Archery trainer, so he can only train you up to level 50 in that skill.