Learning to play guitar by learning guitar songs is a great approach. When you learn guitar this way, you are learning new techniques within the context of music. Learning guitar scales, chords or other concepts in isolation is beneficial. But you'll gain a deeper understanding of the guitar when you apply those concepts to real music. By doing so you'll need to account for timing, rhythm, blending with other instruments, chord changes, groove and other things. Learning to play guitar by learning songs will take you comprehension to the next level. Highly reccomended!