Let’s start with me explaining the chart I made for you:
I put the names of the strings over there on the left so we know which way is up and down, and the names of the first three frets, which by the way I suggest also indicate which finger to use. Keep your fingers in place, over the frets, while you play to make it a little more efficient. (By the way… technically speaking, the little metal strips are actually the frets, and where we put our fingers are the spaces between the frets.)
Now let’s start with the third finger, third fret on the A string.
Then the second finger, second fret,
Then an open A string
Third finger on the E string
First finger on the E string
Open E string
Second finger on the C string
Open C string
THERE! You just played a C scale. Please learn that. Play it high to low and low to high.
Try playing the first 3 notes, then start on the second note and play the next 3 notes, etc.
Play it in any order you want.
Now, you can pretty much play any of those notes while playing most songs that are in C – and it works fairly well over the F and G chords when all in the same song – try it and see.
Any questions? Please ask them in the comments section.