No catch. That's the simple truth. You can pick up all this material in two different ways:
Alternate Option #1 — Hire a guitar teacher using either the classifieds, Craigslist or Google search. They'll likely teach you what you need to know about music theory and the fundamentals of the guitar fretboard. I would recommend interviewing at least three different teachers to find one with a teaching style that matches your learning style. All told, this will take at least 10 weeks or more. At $20-$50 per lesson, that'll run you between $200 and $500.
Alternate Option #2 — Find free lessons on YouTube (using the outline above). Go search "Guitar Intervals lesson", for example, and choose from one of the 98,500+ results. If you go this route, keep in mind, there's zero guarantee of quality or satisfaction. You can pretty much better you'll need an hour or more just to find the right lesson video for you. And the more important caveat, you'll be spammed with ads and link trackers. (Remember: if it's free, you're the product.)
Why I think our Fretboard Fundamentals DVD Master Set Is Better Than Those — Sure, it's not free. But it's gives you a self-contained, start-to-finish set of instructional videos on exactly what to do...
• There's No Guesswork — We give you exactly what you need to get you up to "cruising speed" on theory.
• Guaranteed Quality & Satisfaction — We've been doing this for years with thousands of happy customers.
• On-Demand Teaching — Can a teacher come over at a moment's notice, any time for the rest of your life?
• Stop. Rewind. Fast-Forward. — Learn at your own speed, whether you have 10 minutes a day or 60.