Does not contain any cryptocoin or blockchain.
Ever wondered how your computer is able to securely connect to your bank, Facebook and Twitter? Why your computer talks AES, GCM and X25519, and when it would do the ChaCha? How TLS makes a "secure" connection, and what "secure" even means?
Let me explain to you in detail how your computer sets up a TLS connection, what elements are involved in this, how they work and why this gives you a secure connection.