When you play the right note or chord, you will hear it. It will be a pleasant sound, it will be clear and won't have any blocked string sounds (unless it needs to, but you'll get to that later). To play a note or chord correctly, you have to get your fingers in the right position and press as hard as you can on the frets; it will become a habit if you practice enough.
What can be done so that students can play the music they want and build a strong technical foundation? Taking guitar lessons is a great approach. A good guitar instructor can analyze a song a student is wanting to learn, arrange it so that it is playable at a student’s current technical level, and then develop exercises to aid in playing that song.
My problem with truefire is that they have so much stuff, that you get lost in their site. So for example, if you click on blues courses, they have 116 individual blues courses. They do have so called “learning paths”, where they give you the order in which you should tackle the separate courses, but those are just that, separate courses, so not really created with continuity in mind.

ANYBODY, OF EVERY ABILITY, CAN PLAY – Designed for every type of learner, ChordBuddy includes modifications that allow individuals of every ability to successfully learn a new instrument. Perfect for use in the music therapy, home, or school setting, ChordBuddy can help individuals learn to play the guitar flat or with two people at a time, making for what is an all-around therapeutic experience.