Signal is not the place for top secret communications, but it might be the right choice for you – a cybersecurity expert on what to look for in a secure messaging app
Keeping your chats secure is a good idea, but end-to-end encryption is just the beginning of the list of options to consider when picking a messaging app.
There's nothing to know; facebook is facebook, and nobody trusts facebook for data security. Whatsapp is not, nor will it ever be, true end to end encryption, when facebook owns the locks and keys.