TLS stands for Transport Layer Security and is a cryptography protocol. Learning about the updated TLS 1.3 can be a bit daunting, but not impossible with the internet as a resource. The link provided at the top is an excellent breakdown of what every piece within TLS does and goes in great detail to ensure that it is all explained within a relatively sane manner. Understanding cryptographic protocols is important for a cyber security expert, so it is worth a peak if you plan on going down this path.
Learning Every Byte in TLS
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TJJohnson Learning Security 