Open Chrome on your Chromebook
Go to the webpage you want to bookmark
Click the star icon in the address bar
Choose a name for the bookmark if needed
Select the folder where you want to save it
Click Done
To open bookmarks, click the three-dot menu in Chrome
Select Bookmarks
Choose the saved bookmark from the list
To bookmark with a keyboard shortcut, press Ctrl + D
To show the bookmarks bar, press Ctrl + Shift + B