Rule 14. Know your spelling and grammar rules, but don’t correct anyone on their mistakes unsolicited.

It’s just rude. Plus, no one will be able to stand you. – Mom

This link will help explain the confusing rules:

Take it from someone whose grammar stinks, grammar is important and it will help you tremendously in the professional world. Although, in the future you will probably write business proposals in emoji’s or something dumb like that. – Dad.