How to play ghost/dead/muted notes?

[Krescht]

Found this post:

Help with tab notation

Jim - The X is a ghost note. It means that you’re plucking the string with your right hand to create a rhythmic sound, but the left hand is not fretting a note - the Left Hand is laying lightly on the strings so that no true tone is produced. It makes a cool thud-like sound. I couldn’t find a Josh lesson that was focused on this specifically, but I did find this:

Haven’t watched the video that’s in it yet