The first lecture in this track explained why Cypress has walls. This one is the practical list, and more importantly, what to do at each one.
The senior behaviour being taught here is not memorising workarounds. It is naming the limit accurately, choosing deliberately, and being able to say "this is the wrong tool for this test" without it being an attack on the tool.
Multiple tabs. Not supported, and will not be.
A test cannot control a second tab, because a tab cannot control another tab.