Jupiter shows four satellites aligned along the equatorial plane, appearing as a model of the solar system. For observing the Rings of Saturn, you will need of an instrument of good quality and high magnification power. The comparison between the apparent sizes of Jupiter and Saturn give you an idea of great distances in astronomy. You can also see Venus, which shows phases as the Moon, and you can even see star clusters and double stars. What you can do, instead, is to project the image of the Sun on a screen or on a wall of your room.
Terrestrial observations are also amusing.
With the telescope, you can appreciate that the birds flying in your garden are not all sparrows, but also titmice, robins, finches, blackcaps, etc. With your telescope, you will be able to recognize the various species by their colored plumage.