Relation between clefs
If you consider a virtual 11 lines the staff (stave ), clefs are placed like this:
All notes on the example above are in fact the same note, the same pitch, these notes are sounding the same, they are a C note.
But why so many clefs? Clefs can be used to avoid ledger lines because music notes will too much ledger lines are difficult to read for the musician.
Relation between treble clef and bass clef
The relation between treble clef and bass clef is very simple: The C note below the staff (stave ) in treble key is the same music note that the C note above the staff (stave ) in bass clef.