6:26 Skip Hex Grid Creation to Drawing 3D Shapes
This tutorial is a fun one because it goes over how to create 3D isometric shapes inside Adobe Illustrating using a hex grid. This video covers both how to create a hex grid by making a series of hexagons and organizing them, as well as how to utilize this hex grid to quickly and easily make custom isometric shapes.
This method is perfect for creating Monument Valley / M.C. Escher style images, and is also just a lot of fun to create with because of the interesting visual problems that it allows you to consider and work with. You can make something as simple as a cube to things as complex as your imagination allows.