Four websites that offer free acoustic guitar lessons as of 2015 are JustinGuitar.com, GuitarLessons, FreeGuitarVideos.com and TheGuitarSuite.com. Youtube also has many user-submitted videos with free lessons.
JustinGuitar.com breaks lessons down into stages with videos, pictures, audio, chord charts and text. GuitarLessons.com organizes lessons into beginning, rhythm, lead and blues series with video, text and chord diagrams in each lesson. As of 2015, FreeGuitarVideos.com had 16 free acoustic guitar video lessons, often supplemented with chord diagrams, tablature and sheet music. TheGuitarSuite.com has many lessons organized into categories such as practice, technique, theory and songwriting. Lesson tools include video, text, scales, chord charts, links and practice schedules.