So i know this is a noob question but whats the best way to strum and not hit the top string for like octave and power chords on the 3rd, 4th and 5th strings. Everytime i strum up and down the 6th string rings out.
jus mute it....either with ur thumb or the tip of the finger ur using on the 5th string...but if u want a cleaner sound jus practise hitting jus the 5th 4th and 3rd...itll take time...but everything in guitar usually does
Practice by looking at your strumming hand and make sure you don't hit the 6th string. Strum the bottom 5 strings over and over, then when you have it down, stop looking at your strumming hand.

Worked for me. :/