It's start of term time and as usual these quick tips came up as not all new colleagues knew about them (and with our classroom screens the latter one is often why what you think should be there, isn't!. The former one similarly for online teaching).
When presenting many people have trouble getting what they want on a screen. Two shortcuts, helpful to know for quick access:
Alt+Tab - switch between open windows e.g. Slides and browser/software. Good when teaching online on one screen.
Win+P - change room screen, mirror or a second display?