The least helpful thing when you’re learning how to write that you should probably avoid is overthinking. Yeah maybe it’s good to overthink sometimes as it widens your creativity and liberty when you’re writing, but it could actually mess it up. I write a lot myself and overthinking has absolutely demolished and ruined my whole article, as you have these little arguments in your mind on which kind of scenario you would want to write down and which to not. Say you have scenario 1 and scenario 2, overthinking as in putting yourself into a character’s shoes REALLY messes it up, as you would start thinking about how it will actually affect them though they are fictional. Honestly, this is based on my experience, but overthinking is really helpful sometimes, however, for me, it’s something I need to avoid. Hope this helped :)