Last time I cooked a steak for myself as a midnight snack, I accidentally overcooked it. I'd go back in time when it happened and pay better attention to it cooking.
Yeah, instead of cutting timber and building things out of rocks I'd go back to 18, go for a cheap assed law and finance degree from Podunk U. and get into politics or banking. Or both. Then I could be a limp wristed soi boi paper pusher with monthly vacations to EVERYWHERE instead of doing real work, and at the same time cheating old people out of their life savings.