This document discusses 20 common grammatical errors that should be avoided. It is divided into three sections: homonyms that are often confused (e.g. there/their/they're), punctuation rules that are often misused (e.g. commas vs. semicolons), and other grammatical mistakes (e.g. using "impactful"). Each error is explained with examples of correct usage. The document concludes by promoting the writing assistance service MyAssignmenthelp.com, which claims to provide error-free assignments on time and at affordable prices.