If you are wanting to learn classical guitar it is recommended to use a nylon-string guitar for classical playing, as it produces the warm, mellow tones that are characteristic of the style. Otherwise, for beginners, an acoustic nylon string guitar or an electric guitar with a smaller body and lighter strings is usually recommended. The choice between acoustic and electric depends on the style of music you're interested in. It is best to first enquire and speak to your teacher before you begin.