I use a lot of strike-through during my day (well, hopefully, I do as I get things done!). Here’s a couple of keyboard short-cuts for strike-through on different digital products:
OneNote: Ctrl + –Roam Research: Win + Y
Word: Ctrl + D (font menu) then Alt + K (tick strike-through) then EnterExcel: Ctrl + 5Google Docs: Alt + Shift + 5
Lync: Ctrl+TSticky notes: Ctrl+T