Nylon string guitars, frequently called 'classical', are known to be the most user friendly of guitars. The strings are thicker and looser.
Steel string guitars are louder, and tend to be the most popular of the acoustics category. It is not advised to start with a steel string guitar if you are a beginner as they are more difficult to play. This is partly due to the fact that the steel strings are harsh on the beginner fingers. The fingers need to build up calluses, so that it does not hurt to press the strings hard enough. The reason to press the strings hard is to get the tone you desire. There are two different types of string guitars, one being the twelve-string and the other being the six-string. The twelve string guitar is bulky and is complicated to learn and play.
Hollow body guitars are usually simpler in the way they are set up, and they rely on natural sound rather than electronics. The acoustic sound quality gets amplified which then

Solid body guitars are more adaptable and can be played at loud volumes. The solid body guitar allows for easier processing of the sound that is distributed. Due to this versatility this type of guitar is preferred by rock guitar players.
Resonators guitars are typically acoustic but always steel string. These guitars have a resonator which is built into the speaker-like area. This type of guitar was intended to increase volume sound.