If you are often worried about losing important WhatsApp messages then this is the option for you.
This option allows you to save addresses, passwords or other important information sent by family members or friends. This option is called starred messages.
To save any important message, open the desired chat and press your finger on it to save the desired message. Soon a star will appear at the top. As soon as you click on it, your message will be saved.
Go back to WhatsApp chats to see the saved message. Press the 3 dot option on the top right hand side. A drop down menu will open. Click on starred messages in it and view your saved messages.