What types of guitars are typically used in a hard rock band?

I want to learn to play guitar(s). I'm not interested in b or acoustic at this time. I have never attempted to learn, and I will do so mostly by ear. I'm sure this is more difficult than other methods, but I want the enrichment of that experience and have a gifted mind, so I should be able to do this with much persistence and practice. Music seems to calm my constant, fast moving or hyper-focused thoughts. So what I want to know is this; what are the types of guitars that bands such as ZZ Top use regularly? Their guitar's musical notes seem very harmonious, and this is what I need. I've noticed that, while following the combination of notes during track playback, it seems to feel right and good in my mind to move right along with the music of their electric guitars, but I don't have a clue about differentiating one type of guitar from the next. Some of it sounds a bit monotonous, but it seems to flow well. I've noticed different sounds from different guitars. Some high pitched and seem to be commanding and out front, while others are dirtier or grungier sounding and mostly background guitars that set the pace, and I've heard more than one of the pace setting types. Answers mostly, but website links would be useful. Thank you all. Anyone feeling generous enough to give other helpful or encouraging tips will be appreciated as well. I wish I could give points to everyone.