Last year during NaNoWriMo, Grammarly worked with nearly 500 writers from 54 countries to crowdsource a novel. They analyzed the resulting 40,000 or so words and uncovered some writing mistakes that happened time and again, then summarized the top five in a handy infographic.
Reprinted with permission. Infographic and body content of the article attributed to https://www.grammarly.com/grammar-check