[Moose408]

You are basically playing scales. Once you know the notes in a given scale you can play those notes anywhere they reside on the fretboard. The C major scale is the most straightforward as there are only whole notes (no sharps or flats). It goes C D E F G A B. So any whole note on the fretboard is part of the C major scale.

For other keys you just play the scale corresponding to that key and any note in that scale would work for that key.