Illustrator Tutorials

1. https://helpx.adobe.com/illustrator/tutorials.html

This is a helpful tutorials. There are several topics and easy to understand videos with different levels to choose from. These from adobe are helpful with any software. 

2. https://www.creativebloq.com/digital-art/illustrator-tutorials-1232697

I use these tutorials for photoshop as well. It is easy to understand with pictures, and videos. This is a good one.

3. https://www.tutpad.com/tutorials/illustration-create-a-mexican-food-icon-set
I liked these because they are all by different people with different ways of explaining things.