I know I keep mentioning Assembly App for IOS but it is going from strength to strength and their ongoing video tutorials are a vision into the future for anyone using Adobe Illustrator, Affinity Designer or Sketch for more and more graphics tasks.
Check out this new one - https://www.youtube.com/watch?v=m-DkvIcTnpg
Or this excellent simple logo creation tutorial - https://www.youtube.com/watch?v=DOOvAVxzN8Y
No longer do you need a Mac, expensive software and a great deal of leaning how to use the software when teenagers can do this stuff on their Mums iPad while waiting for a bus.