As Whatsapp is not available on Mac running macOS, you can make use of Keybaord shortcuts to navigate through the application and perform certain actions,
How to know keyboard shortcuts for Whatsapp?
You can open the Application and go to the Apple menu: Whatsapp -> Preferences -> Keyboard Shortcuts

WhatsApp Keyboard Shortcuts
List of Keyboard Shortcuts
- Mark as Unread: Cmd + Shift + U
- Mute: Cmd + Shift + M
- Archive Chat: Cmd + Shift + E
- Delete Chat: Cmd + Shift + D
- Pin Chat: Cmd + Shift + P
- Search: Cmd + F
- Search Chat: Cmd + Shift + F
- New Chat: Cmd + N
- New Group: Cmd + Shift + N
- Profile and About: Cmd + P
- Increase Speed of Seelected Voice Message: Shift + .
- Decrease Speed of Seelected Voice Message: Shift + ,
- Settings: Cmd + ,
- Emoji Panel: Cmd + E
- Gif Panel: Cmd + G
- Sticker Panel: Cmd + S
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