GRAMMAR. If you haven’t done so before, now is the time to start taking an interest in grammar. Unless you’re an English super-scholar, nobody is going to expect you to have perfect grammar, but anyone interested in writing should be interested in writing well. There are lots of basic guides to grammar that can help you tidy up some common mistakes, but it’s also a good idea to start paying close attention to details in everything you read. This will help as you put your own mental map together of what good writing looks like. Editors will be there to help polish a final piece, but you’ll find your entire writing process easier if you write carefully from the start.
What else you should not do ? Maybe this tip can help you.