This exercise is from the Core Skills section on Slides.

In this example we use the same chord slides as the last exercise (C# dim and D# dim). This time we pick the first note of the chord and then perform the slide, before continuing to pick the next 2 notes of the chord.

Sliding 'into' chords like this is very common in guitar playing. Of course, it doesn't have to be between chords either. Sliding is a common way of moving between different neck positions when playing solos too.

Notice that even though 2 strings aren't played, we still slide them. If we didn't, then it would be more awkward to sound out the next notes quickly enough. Even though we slide the other 2 notes, you can't hear them because the first note is much louder and dominates the sound.

This type of playing is called 'positional play' and is a common guitar tactic. It's very important. It's all about having your fingers ready and in the most convenient place to play the next note(s). When reading music score or tablature, it is difficult to convey this aspect of playing, because of the linear format. You are shown what note is to be played, but not what way to have your fingers prepared in order to play the next note(s) in the most efficient way. Learning how to do this is very important, and means thinking more about how you play.