Playing the guitar is one of my favorite hobbies.
Modern guitar type instruments were not made until the Renaissance. 
They are still pretty old. That's very interesting.
The classical guitar has 12 frets. The strings are made of nylon instead of metal. 
I wonder if it sounded any better than modern guitars?
polyphonic instruments, and is notoriously difficult to master.
General.
Classical guitar technique can be organized broadly into subsections for the right hand, the left hand, and miscellaneous. In guitar, performance elements such as musical dynamic and tonal variation are mostly determined by the hand that physically produces the sound. In other words, the hand that plucks the strings defines the musical expression. Historically, this role has been assigned to the dominant hand which, for the majority of players, is the right hand. Similar reasoning
Classical guitar strings
Classical guitar strings are strings manufactured for use on classical guitars. While steel-string acoustic guitar strings and electric guitar strings are made of metal, modern classical guitar strings are made of nylon and nylon wound with wire, which produces a different sound to the metal strings. Classical guitar strings were originally made with animal intestine and silk wound with animal intestine up until World War II, when war restrictions led Albert Augustine Ltd. to develop nylon strings. Nylon guitar strings were put into production in 1948. Strings