We covered quite a bit in Season 1.  For some "Go Deeper" resource suggestions for each topic, check the notes below.
Episode 1: How email travels

Differences between POP3 and IMAP - GeeksforGeeks
SMTP or IMAP: What’s the Difference? Bonus: What is POP3?

Episode 2: OSI model. Internet

Network Engineer Specialization: https://www.coursera.org/specializations/computer-communications

The first course is relevant here: https://www.coursera.org/learn/fundamentals-network-communications?specialization=computer-communications
GeeksforGeeks article: Layers of OSI Model - GeeksforGeeks
Cloudflare: What is the OSI Model? | Cloudflare


Youtube Series: Network Fundamentals by Network Direction channel: https://www.youtube.com/watch?v=cNwEVYkx2Kk&list=PLDQaRcbiSnqF5U8ffMgZzS7fq1rHUI3Q8
Computer Networking book

Episode 3 & 4;  Interview with Marwan Fayed (Cloudflare)

Marwan Fayed Twitter
Marwan research
Marwan Cloudflare blog
Computerphile TLS video
Wikipedia has a good write up
Cloudflare write up

Episode 5: TCP/IP

Cloudflare - article
FreeCodeCamp - article
Coursera specialization
Book: TCP/IP Illustrated

Episodes 6 & 7: Interview with Aaron Blum and Raphael Poss (Cockroach Labs)

Cockroach Labs University
Aaron
Raphael
NoStarchPress: has many great books

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