Helpful generic MacOS keyboard shortcuts

Find documents, files, e-mail, convert currencies, measurements and do some calculating.
, Settings for active application.
D Lookup selected word in the dictionary.
L Lookup selected word in google.
Q Lock computer.
Open emoji’s
F Show active application in fullscreen.
Switch between open applications. Q closes selected application.
Shows all open applications. (except minimized)
Show all open windows for active application.
Go to next virtual desktop.
Go to previous virtual desktop.
esc Reads selected text out loud.
F Fullscreen any app.
F Maximize app.
C Center app on screen.