Finder (Launcher) does not work since new macOS Big Sur update 11.2.1 plus additional issues

1) Finder (application not responding) error.

2) iCloud Drive may not work properly. Please check the iCloud preference pane.

(Couldn't communicate with a helper application)

3) Spinning Pinwheel will not allow opening anything on desktop.

I don't know what is happening to my computer.

I am not computer savvy, why are there so many issues after updates?