WhatsApp Tricks You Might Not Know
iOS: Settings > Account > Privacy > Screen Lock > Toggle on Require Face ID / Require Touch ID > Select the time duration (Immediately, after a minute, after 15 minutes or after an hour).
iOS: Settings > Account > Privacy > Toggle off Read Receipts. Android: Settings > Account > Privacy > Untick Read Receipts.
For *bold*, place an asterisk on either side of the word or phrase. For _italic_, place an underscore on each side of the word or phrase. For ~strikethrough~ add tildes on each side of the word or phrase.
iOS: Chat > Specific chat > Tap on contact or subject at top of display > Save to Camera Roll > Set to Always or Never.