Hi there,

Buzzing strings can be a number of issues. Usually it is the string height, or the action that is causing string buzz.

With an acoustic guitar like your glassical guitar, it may be more difficult to adjust string height. You will have to make a truss rod adjustment, which we do not recommend doing yourself if you've never done it before, since you can easily damage your guitar doing this.

Another possible issue is uneven frets, which you can sand or file down so that they're all even, but this is also tough to figure out if you've never done this.

You can check out this lesson with Gary, and he talks a bit about action and fret buzz: https://www.guitartricks.com/lesson.php?input=29810

I hope that helps!

-Billy