Hey jvctele,

Some palm-muting is a great way to mute extra strings! Keeping strings from ringing is a life-long technique that you'll use forever. There are so many ways to do it.

With your fretting hand, you can use your extra fingers to lay them across the strings you don't want to ring. For example, if you're playing on the G string, the tip of your finger can always overlap the string you're fretting just a little bit to mute the adjacent D string. And the rest of your finger can be used to mute the B and E. This is how guitarists seem to be able to wildly swing their picking hand at the guitar and hit only the notes they want.

So to keep that B string from ringing, use the tip of your fretting fingers to lightly mute it. That should help once you get the hang of it.

It's a never-ending process. You'll find that as you develop, for every note you play, you'll be finding some way to keep several other strings from ringing. There are so many tricks -- some guitarists even use extra fingers on their right hand while picking, and even using their pick to mute adjacent strings. But this will all become a habit over time, so there's no need to rush it. Just conquer one at a time.

Hope that helps!

-Carl.