We have nine planets in our Solar System. These planets circle around the sun (as I’m sure you know already) this is called orbits.
A lot of astronomy people like to think of the Solar System been made up in two parts
We have the Inner Solar System which has Mercury, Venus, Earth and not forgetting Mars. These are closest to the sun and are called the terrestrial planets simply because the have very solid rocky surfaces.
The Outer Solar System has Jupiter, Saturn, Uranus, Neptune these are sometimes called the gas giants
Out past Neptune you’ll find the small planet of Pluto which has a solid but icier surface. Many don’t class this as a planet anymore but you can read this on the Pluto page.
These two systems are separated by the asteroid belt
Our Solar System also contains comets, moons, dust, gas and some minor planets.