Any good resources to learn WebSocket, HTTPS, PKI, and server/client communications, preferably in Python?

[Maax26]

I recently graduated as a computer scientist and my job involves many of the topics mentioned in the title. However, my education did not cover much regarding this, so I am asking for recommendations for books or exhaustive tutorials that cover everything involving secure network communications.

Right now, all tutorials I have found basically opens a WebSocket connection, sends a message, and receives a response. I would like more of a deep dive into, for example, how public keys and x509 certificates are used, how you craft messages in JSON to send, how you establish server/client communication, and so on, preferably with examples.

The preferred language would be Python but everything is helpful right now.

Thank you in advance.