Win+D - show desktop
Win+A - show activities
Win+M - open notifications menu
Win+L - lock the screen
Win+S - workspace overview
Alt+F2 - run a command
Alt+Space - open window menu
Alt+` - switch between windows of the same application
Ctrl+F - search files
Ctrl+L - clear (in terminal)/show folder path (in Files explorer)
Ctrl+Q - close the window
Ctrl+I - selected file properties
Ctrl+H - show hidden files (in FIles explorer)
Ctrl+Alt+Arrow Left/Right - cycle between the workspaces
Ctrl+Alt+T - open terminal
Ctrl+Shift+T - open a terminal tab in existing terminal window