Underrated beginner mistakes [v3]

I want to write something more comprehensive about this later but starting with a quick post to gather thoughts. Been thinking about this for a while and curious what the community thinks. Not sure if this is the right place to ask, mods please remove if it is not.

I want to write something more comprehensive about this later but starting with a quick post to gather thoughts. I tried three different approaches and none of them felt quite right.