Taking a walk around the web I have come across very interesting resources. These are fairly elaborate proposals through the application of Adobe Illustrator. A set of tutorials explained step by step so that we can get started with the program. There are some much more complex than others, depending on the level you have and the needs you have, I would recommend that you start from the most basic level.
If you are a newbie to these worlds, I would recommend that you visit the web free courses, tutorials and video tutorials where the operation of the tools, the interface and the most useful commands is explained. Although it is an application that, since it comes from Adobe, shares a large part of its characteristics with Photoshop or InDesign, you should take a look because in certain ways there are important differences in terms of usability and internal organization.
Altogether it is a selection of ten tutorials, here I leave them. Of course, they all come in English so if you do not master the language I recommend that you use the google translation service. In general, you don't have to have a problem since most of the concepts used are basic and easy to translate. I hope you dare with any of these tutorials and why not improvise on them and create new content. Come on, everyone enjoy like dwarves! ;)