Beginner lessons start from very beginning. Even if you haven't held guitar in your hands before. There's also links to 'Songs made easy' and 'Practice for begginners' lessons series in a beginner Core learning starting page.

Experienced lessons are categorized into four paths (some of the content do overlap in different paths). Blues, Country, Rock and Acoustic. And provides links to various lessons series. Styles, Techniques, Artist studies, Practice, Chords & Scales and Gear & Tone.