1. Basic NoSQL concepts & when to use

• https://www.geeksforgeeks.org/system-design/which-database-to-choose-while-designing-a-system-sql-or-nosql/
• https://www.designgurus.io/blog/no-slq-database

2. CDN

• https://www.geeksforgeeks.org/system-design/designing-content-delivery-network-cdn-system-design/
• https://www.designgurus.io/blog/content-delivery-network-cdn-system-design-basics

6. Distributed systems challenges

• https://en.wikipedia.org/wiki/Fallacies_of_distributed_computing (classic fallacies)
• ByteByteGo GitHub: https://github.com/ByteByteGoHq/system-design-101 (visuals for eventual consistency)

1. Back of the Envelope
2. Redis Use Cases
3. How Kafka Works (high-level)
4. How JWT Works
5. How Do WebSockets Work
6. Service Discovery (basics)

ByteByteGo

1. The Ultimate Redis 101 + Redis Use Cases
2. Why is Kafka Fast? + The Ultimate Kafka 101 (high-level architecture)
3. Sessions, Tokens, JWT, SSO, and OAuth Explained