How many dwarf planets are there in 2020?
According to the International Astronomical Union IAU for short, there are currently five planets classified and accepted as dwarf planets: Ceres, Pluto, Makemake, Haumea, and Eris.
These dwarf planets are much smaller than the Earth
Here is pluto compared to the Earth
Except for Seres, which is found in the main asteroid belt, these dwarf planets are located beyond Neptune in the Kuiper Belt.
For several years these celestial bodies were called plutinos because Astronomers didn't agree on how to classify them.

Transcript
http://www.moomoomathblog.com/2020/09/meet-5-dwarf-planets.html

Picture of Eris
https://en.wikipedia.org/wiki/Dwarf_planet

Facts about the 8 Planets
https://youtu.be/0GL_KF-jOVg