When these clefs are placed on a line, they fix a reference note to that line: an F-clef says that line must be the F below middle C, a G-clef says the line it is placed on is G above middle C, and ...

The bass clef adopts very similar properties, but the notes are slightly different; the line note-names are G-B-D-F and A, and as a rhyme, you could try ‘Good Burritos Don’t Fall Apart ...

To avoid writing notes with lots of ledger lines you can change clef which can make it easier for musicians to read your music. If your notes are getting too low you can switch to bass clef: ...