Could I possibly get some guidance on how to start the corners of the cube? I'm a bit stuck and feel like I'm missing something super simple.

Select the corner vertices, press CRTL B for the bevel command, and press V for vertex bevel.

Thanks a bunch!

Very neat but where was that explained in the course?  Would save people a lot of time knifing in new geometry!

I was going back through, and I think the information was covered (slightly differently) in the bevel tool video around 5:00.