Keyboard function keys really do have
functions and some are quite handy. Function keys are usually on
the top row and have an F followed by a number, such as F1, F2,
etc.
The most universal is F1, press it and you get help for almost
every program you happen to be using.
F3 is handy for doing searches. For instance, if you are in a
document or on a long web page, just press F3 and a search bar
appears on the bottom of your screen. (You can also open a
search box by holding down the CTRL key and hitting the letter
f.)
F6 is handy if you are using a browser. It jumps the cursor to
the address bar so you can type a new address in it.
Obviously there are more, but some are used by specific
programs, such as F7 while in Microsoft Word checks for
spelling. Try them, you may be surprised at how much time you
can save.