First of all, you don't say "does and dont." The proper way to say it is "DOs and DON'Ts." Don't forget the apostrophes and be careful with how you spell the words. It's advisable to keep a dictionary near you when you're writing something just in case you don't know how to spell a word or if you want to be sure of the meaning of a certain word. Also, be careful with the words you use. For example, the common mistakes of using "your" instead of "you're" or "it's" instead of "its." In cases like these wherein the words sound the same but have different spellings, you have to make sure you know what both words mean in order to convey the message you want to convey accurately.