#1
if you play a powercord anywhere
can you just bar the 5th and 4th strings with your ring finger ors hould i use my ring and pinky
#2
I would say use your ring and pinky, it allows for the easy adding of other intervals on top like major and minor thirds; if you barre it you're more likely to mute the strings by accident.
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#3
it really depends on what kind of music you're playing. I also prefer to use my ring and pinky for the same reasons as above but the likes of kirk hammett just barre it.