QMK Programming -- 2

Looking for someone experienced with QMK to work on a number of macros. I need a few macros but some are more pressing than others. I would also like some guidance on how I can do some of these myself and hoping to learn the basics, so I will ask you to explain things at times if that is ok. So first one is ALT TAB. I was really surprised QMK did not have this in the Quantum tab! 2. Show all windows such as swipe right on windows 10. 3. Ctrl+Alt+Shift+S 4. forgot CTRL G 5. Windows Key Left arrow re number 2 above, I should have added that would be Windows + tab