There are a lot of common mistakes that are made with drafts. Here are a few you must watch out for:
Writing about something you're close to Whether it is business, personal or otherwise, writing about topics that are close to you is discouraged as the article you will create may not be neutral.
Copy and pasting material You must write the article in your own words, or it may be deleted.
Overly promotional language Terms like "leading expert" and "ground-breaking technology" sound great when promoting a product, but they do not belong on Wikipedia. Let the facts speak for themselves.