Desmos

https://www.desmos.com/
The purpose of this site as the vision says is to make math fun throughthe right tools and teaches. thry believe  learning is a process of exploration and discovery that is why they created this tool.
The use of this tech tool is very easy. you dont need an account or anything its just on the website, it is like a normal graphing calculator. the basic idea of this tool is you make drawings with lines by making the drawings you learn about equations. You start putting equations one after the other to create the drawings. You can put  a polar graph, plot a point, graph a conic section, and graph a parametric curve. But of course you need to know the math.
Step by step use: go to desmos.com
click on laungh calculator
click on the corner right besides the one
right an equation
each equation you want to add you click on create new expression.
and have fun!!!!
Example by me: https://www.desmos.com/calculator/lz8rsqczz6
Example by others:https://www.desmos.com/calculator/t5zhqfamfj
https://www.desmos.com/calculator/tej31f4rq7
https://www.desmos.com/calculator/yibzwhziuq