In most classes, you're encouraged to use Google apps for productivity (Docs for writing, Slides for presentations, and Sheets for spreadsheets). However, if you know what you're doing, you can use simplified versions of Microsoft Office apps (Word, Excel, PowerPoint, and OneNote) on a Chromebook, and store those files in OneDrive. Here's how:

1. Open the app launcher using the circle icon at the bottom left of your screen or by swiping up from the bottom in tablet mode.
2. Open one of the Office applications in the launcher, such as Word:
   
3. When you first open it, you may be prompted to sign into your Microsoft account. Use the same email and password you use to log in to the Chromebook:
   

Once you sign in, you should be at the homepage of the app you chose, where you can create a new document and see your recent files. Files from Word and other Office apps save to OneDrive by default, not Google Drive, so you can access them using the OneDrive app in the app launcher: