If you want to bookmark a site, right click anywhere on the page. Click Bookmark this page, and choose either the bookmarks menu or bookmarks toolbar. If you choose toolbar it will be bookmarked under the address bar. You can edit the properties so only the icons are showing, no text, so you have many bookmarks that are easily and quickly accessible.
If it is not a site you will use often, don't put it on the toolbar, just add it to bookmarks.