I can play my own sings on guitar but find it hard to learn other people's songs?

know 5 finger rule. if in a(thumb) go forward saying b, c, d, e. last 2 fingers indicate song played in d , e. off key next thumb b.
key of a-d e. key of use in sad songs.
can use in keys.
c f , g off key d
g c , d off key
d g , off key e
fine f hard me b hard make quickly. use capo on bb play d f. know f , bb sound same.
capo helps greatly. hope helps play songs.

what mean?

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