Writing is mostly about sentences. You also have to remember Capital letters, punctuation marks,  and homophones. For your sentences to make sense you have to make sure that you have the right homophone, homonym or homograph and Capital letters for the reader to understand. Homophones sound the same but don't spell or mean the same.  homonym are spelt and sound the same but have different meanings.

Homographs words that share the same spelling, sound different and  different meanings.