Fret buzz is usually due to leveling issues and a neck that's not true. I have all the tools, including a pretty sweet one that is a straight edge with slots in it to make room for the frets, so that it lays level on the fretboard. It has both major scale lengths on it.
Its probably just one fret that's too high causing all the buzzing
First, straighten the neck (using the truss rod) and then measure the string height. Next, you want to level the frets. With that done, your next step is to do a setup. That can include nut filing, saddle adjusting (including filing if it's an acoustic), and ensuring the string height is correct.
Not all guitars can be set up properly. Some are just too far gone, but you can make them much better.
Every guitarist should know how to do all this stuff - but so many don't. They either never do it and just deal with it, or they pay someone to do it. You can expect to pay $40 to $100 to have a guitar set up by a professional.
I've never done that stuff
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