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When I first started, the web site I used to use Was the Frank Ford Fret.com site
Frank was one of the original owners of Gryphon Guitars(spelling?) In Palo Alto and did all of the repair work on all types of instruments. He started the Frets.com website and it has a huge amount of information all type of guitar repairs and what causes that weird buzzing noise your guitar is making.
Sadly Frank passed many years ago but the web site is still up. It is a 90’s style web site with out a lot of bells and whistles but is very informative. I go to it all of the time when I’m stuck on a vexing issue on one of my instruments. Check it out. Rule of thumb, If your guitar costs less than $750 and is from over seas it is a good chance that the nut and saddle is not bone.