The #1 thing you should learn in Geogebra if you want to make cool-as-in-cool things is the Sequence command. If you're already familiar with the sequence command on TI's it works the same: Sequence[expression, variable, start, end, interval].
As a simple example, here is a tool I made to subdivide a segment with evenly-spaced points.
But you don't have to just make sequences of points, you can make sequences of anything! Segments, so you can make a grid with a variable number of gridlines. Or an ice cube chopped up into smaller ice cubes:
Sectors, so you can make a customizable circle graph.
And this thing for Pandemic that is just too fun: