Here are some tricks to know:-
1.If someone has turned off their read receipts and you want to know whether they are reading your messages or just ignoring.
Try to send a whats app audio(as small as possible) if they open it, the grey tick will turn blue and you will get to know that you are just getting ignored.
2.Want to see someone’s WhatsApp story without them knowing?
Untick the read receipts.
Now enjoy seeing whats app stories without concern.
3. Want to read deleted messages?
Download Notification log app from play store, allow all the permissions. Next time if anybody deletes a message, open this app the deleted message can still be seen in notification history.