Major scale - Ionian
Pattern 2: Dorian
Pattern 3: Phrygian
Pattern 4: Lydian
Pattern 5: Mixolydian
Pattern 6: Aeolian
Pattern 7: Locrian
Connecting it all!
As with the 'Intermediate' page, the items in the left-hand column suggest a loose timeline of items to cover before one should consider themselves an 'intermediate Stage 2' guitar player. Depending on your style and approach, this may vary to a degree, but for aspiring pop/rock/blues/jazz focused guitar players in particular, knowing the 7 Major scale patterns/modes, theory for building chords, intervals and arpeggios, fretting common bar chords, some common moveable chords, and tentative use of 'vibrato' during improvisation is essential core knowledge. You will need to be comfortable with these concepts before you can effectively move on to more advanced playing techniques and musical concepts with a solid foundation. I do not suggest that you'll be playing all major scale patterns fluently at speed at this stage, but you should know what they are and how to play through them slowly in any key, and you should be able to loosely improvise within these patterns using the picking methods and other techniques covered...still at a somewhat basic level for now, but with more confidence and focus than you would have had upon absorbing the material cited in the initial intermediate section.
Once again, JustinGuitar.com should be your initial go to for intermediate material covering these items:
If you've been using JustinGuitar.com as suggested on the Beginner page, you should have completed his Intermediate Grade 4, 5 & 6 courses before tackling this material, although there may be some crossover.
At this point, if you're serious about becoming a fast flat-pick player, you should also invest in the 'Pickslanting Primer' instructional video package by online guitar tutor Troy Grady, via the link below:
Troy has invested serious time, scientific research and resources into exposing the mechanics and approaches that allow fast guitar players to develop their intimidating technique. Thanks to his work, we now have a resource to rival methodologies for classical string, brass, woodwind and percussion technique instruction in its accuracy and single-minded purpose. It is exceptional work, and a must for all aspiring flat-pick players I believe.