Email Etiquette

When I learnt about email etiquette it was not to new to me because I know not to email my teacher the same way that I email my friends. I also must use capitals in a right tense like at the start of a sentence and when I say their name or surname.  You must also use commas in the right places, and that you must not use full caps when messaging a teacher or an adult. You must also spell everything right and do not use slang or bad words.