#1
what does the O meaN? i pluck all strings?

C

e ---|---|---|---|---|
B -x-|---|---|---|---|
G ---|---|---|---|---|
D ---|-x-|---|---|---|
A ---|---|-x-|---|---|
E ---|---|-o-|---|---|
Am7

e ---|---|-o-|---|---|
B -x-|---|---|---|---|
G ---|---|---|---|---|
D ---|-x-|---|---|---|
A ---|---|---|---|---|
E ---|---|---|---|---|
#2

C

e ---|---|---|---|---|
B -x-|---|---|---|---|
G ---|---|---|---|---|
D ---|-x-|---|---|---|
A ---|---|-x-|---|---|
E ---|---|-o-|---|---| 
Am7

e ---|---|-o-|---|---|
B -x-|---|---|---|---|
G ---|---|---|---|---|
D ---|-x-|---|---|---|
A ---|---|---|---|---|
E ---|---|---|---|---|

The o means to mute that string (don't let it ring out)
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#3
normally a 0 means you should play the open string, although in that c chord I usually mute the low e string
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#4
yeah, here it means mute, but usually it means open string, and x means mute
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#5
It tends to mean "optional" - a note you can add to the chord if you want to.

C is usually this...I've used o's for the strings you do play and an x for strings you don't to make things a little clearer, if the o is at the end of the string then you play it open.


e o ---|---|---|---|---|
B   -o-|---|---|---|---|
G o ---|---|---|---|---|
D   ---|-o-|---|---|---|
A   ---|---|-o-|---|---|
E x ---|---|---|---|---| 


Now, because there's a G in the C major chord you can also add a G note on the low E

e o ---|---|---|---|---|
B   -o-|---|---|---|---|
G o ---|---|---|---|---|
D   ---|-o-|---|---|---|
A   ---|---|-o-|---|---|
E   ---|---|-o-|---|---| 


likewise your Am7 would usually be

e o ---|---|---|---|---|
B   -o-|---|---|---|---|
G o ---|---|---|---|---|
D   ---|-o-|---|---|---|
A o ---|---|---|---|---|
E x ---|---|---|---|---|


...but you could replace the open E with another G to emphasise the "seventhiness" of the chord

e   ---|---|-o-|---|---|
B   -o-|---|---|---|---|
G o ---|---|---|---|---|
D   ---|-o-|---|---|---|
A o ---|---|---|---|---|
E x ---|---|---|---|---|


...you can do that with any chord, indeed a chord on the guitar will nearly always have multiple instances of at least one note.
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