Determine the guitar riff that you want to learn. Listen to acoustic guitar songs that you enjoy and choose one that you'd like to learn. When finding your first song, try to find a song that has an easy chord progression. Listen to the song and determine how many chord changes it has and the speed in which the song is played. If there aren't that many chords or the song seems simple to play, you should choose that song as your first song to learn.
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Minutes 30-60. Practice making the basic 5 shapes. This is probably the hardest part. You gotta put your head down for 30 minutes and remember the chords that are demonstrated below. Once you start getting these shapes down, adding to your portfolio will be easy. You can even experiment with adding and removing fingers– you’ll find a lot of cool sounds here and you’ll continue to discover these for years to come.
As a beginner, it is best to avoid making a pawn shop, flea market, or yard sale purchase unless you are shopping with somebody who has experience in purchasing a guitar. Having never purchased a guitar, you may not know what to look for in terms of damage or guitar quality. With that being said, a local music retail shop is your best bet. You may also shop online with a reputable company, although be sure to review the business’ return policy.