We all have been using the WhatsApp for years now, But there are almost certainly some secret and useful features on whatsapp that we all don't know about.
You can Turn off your read receipts. Go to: Settings > Account settings > Privacy Here Turn of the Read Receipts
Open Group chat, and select the message you want to reply. Now, click on the three dots and You will see an Option to send reply privately.
Open WhatsApp settings, and head over to chats. Now simply turn off the Media Visibility. This will stops the images and video appearing in the gallery.
Open WhatsApp settings, and head over to Account > Privacy click on Profile photo and select any option from Everyone , My contacts, Nobody.
You can pin your favorite chats at the top. Simple Tap and Hold the Chat or group now click on the pin icon to pin the chats.