On keyboards made for Windows PCs, use the Alt key instead of Option, and the Windows logo key instead of Command. Press the Go Back button in a folder if focus is on the button. If pressed in the body of the file list, navigate one level up from within a folder.
Action: Shortcut: Open File: Command + O: Close File: Command + W: Save As: Command + Shift + S: Print a Document: Command + P: Exit Foxit Reader: Command + Q: Save: Command + S. Some particularly important ones are listed here: File Keys. For more keyboard shortcuts, see the Apple Support article Mac keyboard shortcuts.
If you switched to the Mac from a PC, check out the Apple Support article Mac tips for Windows switchers for a list of Mac keyboard shortcuts and the differences between Mac and Windows keyboards.
Mac menus and keyboards often use symbols for certain keys, including modifier keys: For example, to use Command-C (copy), press and hold the Command key, then the C key, then release both keys. To use a keyboard shortcut, press and hold one or more modifier keys and then press the last key of the shortcut.