
Marvin A. answered 04/29/20
BFA in Jazz Guitar Performance in NYC 10+ years of Guitar teaching
I'm not too sure of what you are asking but I am assuming you are a total begginer and will try my best!
If you are wondering why the notes have different names then you should remember that the notes on the fretboard don't change. 5th fret on the E string will always be an A, two frets below A will always be a G etc...
When you play the "a minor" pentatonic scale in 5th position begins on A. In second position it begins on G.
A scale is a specific sequence of notes. You may begin the sequence at any point of the scale
A pentatonic scale is a scale with only five notes after every five notes it repeats.
G A C D E
A C D E G
C D E G A
D E G A C
E G A C D
Above are all examples of the "a minor" pentatonic scale
Since you are learning the fretboard it would be a good idea to experiment playing them in different order (after learning to play them in order) , but without repeating notes like... C A D E G, or D G A C E
listen for the sequence that sounds good to you and learn it all over the fret board.
Have fun practicing and keep asking questions!
-Marvin