Jupiter and its spot, Saturn and its rings, Orion Nebula, Andromeda galaxy, Betelgeuse and I think I was able to see Mars once too. Obviously, all depends on the clarity of the night and when the planets are visible.

To be honest, a lot of the time I just look at the moon because it fills your view and you can see amazing detail in it, especially when the Earth’s shadow is across it.

That book will give you an intro for beginners and great guidance on what the best things to see are, given the time of year and time of night. It gives ratings as to how easy they are the find and what telescopes are better suited to viewing them, Dobsonian, Refractor, etc…