Short story: If you find yourself accessing certain sites or docs frequently, bookmark them (especially SFDC links if you do admin work)!
Ensure your Bookmarks Bar is visible within your browser by clicking 'Bookmarks' on the top of your Computer screen and clicking 'Show Bookmarks Bar'
Once a Folder or Bookmark has been created, you can rename or delete as needed by right clicking it from the Bookmark Bar and selecting the relevant option.