Not just keyboard shortcuts, but keyboard navigation: you can press-and-release Alt and then "walk" through the Ribbon by keyboard: press arrows to switch tabs, move through sections of commands, drill into dropdowns, then Escape to "go back up" a level.
In terms of finding specific things, every version of the Ribbon in Office has had an accompanying search box (today labeled "Tell me what you want to do", and since the beginning labelled with a light-bulb icon, the last remnant of Clippy iconography, RIP). I still think it would be great if search results had an option like "Show me where to find this on the Ribbon next time", but the icons in the search results are the same as on the Ribbon and sometimes just seeing the icon in the search results can help you find it better the next time.
> you can press-and-release Alt and then "walk" through the Ribbon by keyboard
Ah, I see. That doesn't really address my issues, though.
> every version of the Ribbon in Office has had an accompanying search box
It does? I can't find anything like that in O365 Word at all (I haven't checked the other apps). Regardless, that just underscores how bad the ribbon is -- a search function shouldn't be necessary.
In terms of finding specific things, every version of the Ribbon in Office has had an accompanying search box (today labeled "Tell me what you want to do", and since the beginning labelled with a light-bulb icon, the last remnant of Clippy iconography, RIP). I still think it would be great if search results had an option like "Show me where to find this on the Ribbon next time", but the icons in the search results are the same as on the Ribbon and sometimes just seeing the icon in the search results can help you find it better the next time.