Underrated beginner mistakes I keep coming back to [v5]

Spent the last few weekends digging into this and the deeper I go the more questions I have. There is a lot of conflicting advice online and most of it is from 2019.

Spent the last few weekends digging into this and the deeper I go the more questions I have. Looking for honest feedback, not validation.

Looking for honest feedback, not validation. There is a lot of conflicting advice online and most of it is from 2019. Posting this here because the relevant subreddit has gotten too noisy lately.