For example: I have a folder in my bookmarks containing like Youtube which is this url https://www.youtube.com/results?search_query=%s&oq=&gs_l= associated with the keyword "yt" so I can type yt <search term> and it loads the Youtube results. I've also added one for the Mozilla Developer Network (mdn <search term>), Python Documentation (py2 <term> or py3 <term>) and I add others as I use them more.