In Strunk and White’s The Elements of Style, one rule they mention is “omit needless words”.
Most writers don’t always heed that rule. Myself included.
There’s a point we try to get across, so clear in our heads, but so often fumbled on the page.
So when you sit down to write, it’s important to think of the reader, and think of the rules, and think of grammar, and spelling, and everything else.
It’s also important not to think about it, and to just sit down and write.