Parts of the Guitar
Strings and the Fingerboard:
Frets: Frets are strips of metal which are embedded along a guitar's fretboard. By pressing on a string behind a fret, the pitch of that string changes.
Each fret is spaced on the fingerboard in what we call half steps or a semitone. Each fret is one half step away from another. When you press on a fret it raises the pitch of the note by one half step as you go up the neck.
When learning a piece of music this will help you to position your fingers at any fret location much faster than counting up the finger board.
After the 12th fret (with double dots), the fret board starts all over again and the markers continue as from the first fret. For example, if you press down on any string at the 12th fret, you will have the same note as the note on the open string if you did not press on any fret. The note name is the same but the sound is 12 semi tone pitches higher.
Holding the Guitar
Two basic ways of holding the guitar.
Over the right knee (most popular).
Over the Left knee.
Use whatever is most comfortable for you. Make sure to keep the guitar close to your body and don't let it slide down.