Designers typically prefer using a Mac. Sketch is a Mac only app, so you’ll need to use a Mac in that class.
In the Visual Design Bootcamp we recommend using Sketch (which is Mac only). Alternatively you could use Photoshop (Mac or PC) or Adobe XD (Mac or PC) if you know it (even though it’s not taught in this certificate program).
Photoshop and Illustrator work the same on both Mac and PC so for those classes you can use whichever you prefer (Mac or PC).