4.) Check the guitar’s string height by pressing down on the first, second, and third fret. You should be able to do so with minimal effort. Come to the 12th fret and press down. The distance from the top of fret to the bottom of the string should be no more than three times. If it is five times, the guitar may have a warped neck or too high of a bridge.
Electric guitar: Well the world of electric guitars is in some ways more complex, as there are all kinds of different looks and technologies. And it’s not good enough to just have a guitar, you need to buy an amplifier as well. I will just recommend mid-level stuff that’s worked for me based on my preferences, but if you like “stuff” and collecting gear, you’ll find playing the guitar to be a deeply satisfying hobby :)
Electric tuners are easy to use and very accurate. Hold it to the guitar and pluck the high E. The tuner will tell you if the guitar is "sharp" (too high) or "flat" (too low). Pick each note and tighten the string to make it go higher, or give it some slack to lower it. Make sure the room is quiet when using a tuner because the microphone on the tuner can pick up other sounds.

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