Try to not oversplit infinitives.
Don't use commas, which aren't necessary.
Don't write run-on sentences they are hard to read.
Just between you and I, case is important.
Verbs has to agree with their subjects.
About them sentence fragments.
Make each pronoun agree with their antecedent.
Don't use no double negatives.
It is impossible to overestimate the unimportance of practically everything.
When everything appears to be going in one direction, take a long, hard look in the opposite direction.