There are two ways to sign into Google Docs. The first is to sign in with your Google account. This is the same account that you use for Gmail, YouTube, and other Google products. If you don't have a Google account, you can create one for free.
The second way to sign into Google Docs is to sign in with your work or school account. This is the account that your employer or school uses to give you access to Google products like Gmail, Calendar, and Drive. If you're not sure which account to use, contact your employer or school.