There are number of keyboard shortcuts that you can use to speed up your navigation within Foxit Reader. You can click Help menu > Keyboard Mapping to check the keyboard shortcuts. Some particularly important ones are listed here:
File Keys
| 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 | 
| Document Properties | Command + D | 
View Keys
| Action | Shortcut | 
| Zoom In | Command + = | 
| Zoom Out | Command + - | 
| Zoom To | Command + M | 
| Actual Size | Command + 1 | 
| Fit Page | Command + 2 | 
| Fit Width | Command + 3 | 
| Fit Visible | Command + 4 | 
| Single Page | Command + 7 | 
| Continuous | Command + 8 | 
| Facing | Command + 9 | 
| Continuous Facing | Command + 0 | 
| Rotate Right | Shift + Command + = | 
| Rotate Left | Shift + Command + - | 
| Go to Page | Command + G | 
| First Page | Fn + Left Arrow | 
| Last Page | Fn + Right Arrow | 
| Previous View | Command + Left Arrow | 
| Next View | Command + Right Arrow | 
| Full Screen | Command + L | 
| Open Bookmarks Panel | Command + Option + 1 | 
| Open Pages Panel | Command + Option + 2 | 
| Open Layers Panel | Command + Option + 3 | 
| Open Attachments Panel | Command + Option + 4 | 
| Open Comments Panel | Command + Option + 5 | 
Edit Keys
| Action | Shortcut | 
| Copy | Command + C | 
| Cut | Command + X | 
| Paste | Command + V | 
| Undo | Command + Z | 
| Redo | Command + Shift + Z | 
| Select All | Command + A | 
| Add Bookmark | Command + B | 
| Preferences | Command + K | 
| Unrestricted Access | Command + U | 
Tool Keys
| Action | Shortcut | 
| Hand Tool | Command + 5 | 
| Select Text | Command + 6 | 
| Select Annotation | Control + 6 | 
| Find | Command + F | 
| Find Previous | Shift + F3 | 
| Find Next | F3 | 
Comment Keys
| Action | Shortcut | 
| Highlight Text | Control + 1 | 
| Squiggly Underline | Control + 2 | 
| Underline Text | Control + 3 | 
| Strikeout Text | Control + 4 | 
| Replace Text | Control + 5 | 
| Insert Text | Control + 6 | 
| Area Highlight | Control + I | 
| Typewriter | Control + T | 
| Textbox | Control + X | 
| Callout | Control + J | 
| Note | Control + N | 
| Pin a File | Control + B | 
| Rectangle | Control + R | 
| Arrow | Control + A | 
| Line | Control + L | 
| Oval | Control + O | 
| Polyline | Control + Y | 
| Polygon | Control + G | 
| Cloud | Control + C | 
| Pencil | Control + P | 
| Eraser | Control + E | 
| Measure Distance | Control + Shift + D | 
| Measure Perimeter | Control + Shift + P | 
| Measure Area | Control + Shift + A | 
| Keep Tool Selected | Control + Z | 
| Show All Comments | Control + U | 
| Hide All Comments | Control + H | 
| Open All Popups | Control + K | 
| Close All Popups | Control + M | 
Help Keys
| Action | Shortcut | 
| User Manual | F1 |