Few lessons on how to use your watsapp

Turn words bold, italic or strike through
Sometimes certain words need more emphasis and shouty caps just isn't going to cut it. Don't worry, WhatsApp allows you to make whichever words or phrases you want bold, italic, or strike through them altogether.

iOS and Android: Add an asterisk either side of the word or phrase for bold. Add an underscore either side of the word or phrase for italic. Add a tildes to either side of the word or phase for
Find who you talk to most
Who is really your favourite person? It might not be who you think. On iOS, there is a way to find the people you send the most messages to and how much storage each person takes up, among other things.

iOS: Settings > Data and Storage Usage > Storage Usage > Select Contact
Add dates to your calendar automatically
If you're prone to forgetting dates mentioned in various chats, it's possible to automatically create an event directly from WhatsApp on iOS.
iOS: Press and hold date within chat > Create Event
Mark chats as unread
Ever been out and about, read a chat and then completely forgot to reply? We do it all the time. There is a way to mark important chats with dot to remind you to go back to it though.

iOS: Chats > Swipe left to right > Mark as Unread

Android: Long press chat > Open Menu > Mark as Unread
Save your data allowance
If you've got a limited data allowance, you don't want WhatsApp munching it all away. Thankfully, you can customise when media is allowed to download, as well as ensure calls use as little data as possible.

iOS and Android: Settings > Data and Storage Usage > Media Auto-Download