Most common questions used to investigate
Are you placing your fingers in the correct places on the fret board while playing?
Are you putting enough pressure with your fingers while playing?
Are there any loose components on the guitar itself or on the strap?
Are your guitar frets all the same height?
Is your guitar string action (meaning - how close the string is to a specific fret) too low?
Is there enough neck relief in your guitar (meaning - the neck of your guitar should not be perfectly straight, as it should have a slight bow that creates a gap between the strings and the middle of the neck)?
Are your guitar strings sitting steadily in the nut of your guitar?
Common conclusions
Your guitar is buzzing because you are not placing your fingers correctly. Make sure not to place your fingers too far behind the fret.
Your guitar is buzzing because you are not putting enough pressure on the strings while playing.
Your guitar is buzzing because there are loose components that move around while you play. Make sure that all loose components are tightened and sturdy.
Your guitar is buzzing because your frets are not leveled. Take your guitar to a professional for a full fret leveling procedure.
Your guitar is buzzing because your string action is too low. Loosen the strings a bit and then increase the string action by making the proper adjustments at the bridge of your guitar. Using a string action gauge is recommended.
Your guitar is buzzing because there isn't enough neck relief. Adjust the relief by adjusting the truss rod of your guitar.
Your guitar is buzzing because the strings are loose in the nut. Try making sure the strings sit steadily in the nut. Replace your nut if necessary.
Sorry, we weren't able to identify your problem. We recommend taking your guitar to a professional for a set-up.
References
https://www.haloguitars.com/store/blog/what-causes-fret-buzz-and-how-to-fix-it/
https://acousticguitar.com/ask-the-expert-why-is-my-guitar-buzzing/
https://www.fender.com/articles/play/5-ways-to-stop-fret-buzz
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