The next technique to learn is the "trill", indicated in the tab by the symbol Tr. Trills can add drama to your playing as well as being an important way of sustaining a note. A trill is a raped succession of hammer-ons and pull-offs with only the first note being picked. Listen to the recording to hear the correct effect of this technique.
First try example 189, a simple lick in the key of E.
Now try example 190, the same lick as example 189 but the Trill is added.