Unable to type in Apps after update of Tahoe on Mac Os

I cannot type in any of my apps after updating to Tahoe (Mac OS) last night. My keyboard works when I type in Google or Safari searches, and it functions when I go to those websites in the search engine. However, it does not work when I open my apps and try to type or click in specific areas. I have checked to make sure that slow key and sticky key are turned off, but nothing seems to help. I have restarted and also shut down, but nothing works. I am still very new to using my Mac — can you help?