Adobe Illustrator is an essential software for graphic design, because it manipulates vector files as opposed to raster files. The importance of vector files is that they can be resized to any dimension without losing resolution. Whereas resolutions of raster files, used by software such as Photoshop, can be distorted when resized resulting in poor quality output when printed or displayed on the web.
Illustrator is highly versatile used for (you guessed it!) illustrations, logo design, typography, infographics, PDF documents, and much more. And, it's actually a lot of fun to learn!
Check out my class, Basic Digital Illustration: Draw flowers in Illustrator without the pen tool! The pen tool is the key tool in Illustrator, but it can be quite daunting for the beginner user. This is the reason why I created this class: to introduce basic tools and concepts of Illustrator prior to using the pen tool.
If you don't have Adobe Illustrator, you can get a free trial here.
I teach this class on Skillshare, which offers courses in many different areas (photography, culinary skills, design, business, crafts, and much more!). Using the link below, you can get three months of Skillshare for $0.99 and you get access to thousands of classes, not just my course!