Email Etiquette

I learnt to not use slang words and use proper words while texting and using the proper format. I have learnt to use the proper format and to type a long and proper sentences. Now I know to keep it to the point and give a specific subject and  use a salutation and use spaces between. I learnt to use the correct ending like sincerely  and use the correct ending put my first name and put my town and where I live like South Africa and to say dear  not to and put a subject line in my and to put someone address in the letter and put a introduction and to end off the letter.