When talking about ghost notes on guitar, it's important to first define what a ghost note is. A ghost note is simply a note that is played very quietly or with very little volume. Ghost notes are often used to fill in the gaps between other notes and create a more flowing, smooth sound.
There are a few different ways that you can play ghost notes on guitar. One way is to use your right hand to pluck the string lightly while simultaneously using your left hand to mute the string. This will result in a very quiet, muted sound. Another way to play ghost notes is by using a tremolo picking technique. This involves quickly picking the string up and down with your right hand while keeping your left hand close to the string but not actually touching it. This will create a rapid, staccato sound.
One of the best ways to practice playing ghost notes is by using them in conjunction with other techniques such as palm muting or vibrato. By doing this, you'll be able to get a feel for how much pressure you need to use with your right hand and how much movement you need to make with your left hand in order to create the desired sound.