This is an Exercise using Sketch App. I am familiar with this tool, because of I’ve been working on that tool during the whole year 2017–2018 on my last work. What is true is that if you want to illustrate something with a bit of complexity is easier to use Adobe illustrator but, if the exercise requires “simple” forms, sketch is a good tool to use for. The exercise wasn’t difficult for me, the interfase is easy to understand and shortcuts are similar to Illustrator.