While I keep looking for hidden gems, to find original and authentic items to learn from, I came across the following Links. These are really helpful.
System Design:
- http://www.aosabook.org/en/distsys.html
- https://engineering.linkedin.com/distributed-systems/log-what-every-software-engineer-should-know-about-real-time-datas-unifying
- https://www.hiredintech.com/classrooms/system-design
- http://ksat.me/a-plain-english-introduction-to-cap-theorem