Learn how to read guitar tabs. Guitarists have their own system of music notation called guitar tablature, or guitar tabs for short. The basic idea is to look at each line in the "staff" of the tab in the same way you look at your guitar. Each line corresponds to a string, and each number tells you which fret to hold down when plucking that string. For example, to play this tab-notated lick from the Lynyrd Skynyrd song "Sweet Home Alabama," you would play two notes on the open D string, the B string at the third fret, the G string at the second fret, etc.
Okay, so if the diagram had O’s across the whole thing, then you wouldn’t even have to touch the fretboard at all, you would just strum it. However, this diagram has a couple of other marks on it, and those indicate where we need to place our fingers. In this case, they are on the 2nd fret of the 4th and 5th strings. The frets are the metal parts running perpendicular to your fretboard; they are what the string makes contact with when you press your fingers down. On the diagram, the frets are the horizontal lines. So count up to the second fret, and put your fingers down just behind the fret, like in the diagram.
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I would especially like to stress the gentle approach Justin takes with two key aspects that contributed to my development as a musician - music theory and ear training. Justin has succeeded in conveying the importance and profoundness of understanding music both theoretically and through your ears while maintaining a simple and accessible approach to them, all while sticking to what is ultimately the most important motto: 'If it sounds good, it is good'.
Acoustic: I recommend a Yamaha solid top acoustic guitar. This guitar plays just as good as some that are many hundreds of dollars more expensive. It can be difficult to manufacture quality acoustics at low prices due to the importance of a solid top finish. When I was in college I scratched together the cash to buy a handmade acoustic guitar that was over $1,000 (I won’t mention the brand) but that guitar was nowhere near as good as this Yamaha.