Create homepage shortcuts for contacts
If you’re an iPhone user, you’ll want to skip this one: Whatsapp iOS doesn’t support the shortcut feature.
For the Android users amongst you, if you want to add a regular contact or group contact, open the Chat screen and hold your finger down on the contact you want to add a shortcut to. This screen should come up.
Click Add chat shortcut and bosh, there’s now a direct shortcut to that chat stored on your homescreen.