Quick Look opens a preview of any file quickly.
When previewing a folder, you are presented with some basic information about it, such as its size, contents and last modified date.
The default shortcut for the QuickLook preview is the Spacebar. You can change it in the Menu Path Finder > Preferences > Features > Keyboard
You might also use the Quick Look full screen, press the Option key (⌥) – the Quick Look button will change its appearance to a “Play” button. You may select multiple files, then press Option key (⌥) and enjoy