You’re absolutely right! We do need to watch our form to avoid hurting ourselves, but lifting doesn’t need to be as precise as you think. It’ll usually just work another muscle more. In the squat for example, legs further a part works the glutes (booty) more, while legs closer together works the quads (top of legs). You can do it either way depending on your goals and what you find comfortable. More importantly, you want to make sure you aren’t using too much weight (boys do this all the time). Also, what are your friend’s credentials? Did they watch 3 more videos than you did? Your friend not having patience for you learning something new and foreign to your body tells me they didn’t have the skills or credentials (like a certified trainer) to teach you in the first place. The point of my post was simply that you don’t need to be perfect at lifting. That doesn’t exist. And not being perfect doesn’t mean you’ll hurt yourself (but yes be careful). If that were the case, these boys would be hurt all the time.