The lead is the featured guitar, which usually plays single-note-based lines or double-stops. Lead guitar is a guitar part which plays melody lines, instrumental fill passages, guitar solos, and occasionally, some riffs within a song structure. In rock, heavy metal , blues, jazz, punk, fusion, some pop, and other music styles, lead guitar lines are usually supported by a second guitarist who plays rhythm guitar, which consists of accompaniment chords and riffs. To create lead guitar lines, guitarists use scales, modes, arpeggios that are performed using a variety of techniques.
In a blues context, as well as others, lead guitar lines are created using call and response-style riffs that are embellished with string bending, vibrato, and slides. Solos contain all the techniques that you need to acquire for lead playing like bend ups and downs, hammer-ons, pull offs, slides, tapping, vibrato, whammy, etc. These techniques are essential and will develop and improve with every new solo you learn. You also encounter new techniques or tricks every now and then that will keep you on top of your game.
Learning solos will train your memorization skill which you need to store licks, scales, arpeggios and many more solos to create the awesome vocabulary you want to build and expand, it gives you confidence and peace of mind. Learning new solos is also incredibly fun. The enjoyment of playing and mastering your favourite solos is absolutely gratifying. Let alone playing your favourite lead solo in a band, its the best thing ever!