Following has the compilation of best System Design Blogs, Notes, Webistes
[1] https://github.com/checkcheckzz/system-design-interview#ood
[2] https://github.com/andreis/interview#systems-design
[3] https://github.com/shashank88/system_design
[4] https://www.quora.com/How-do-I-prepare-to-answer-design-questions-in-a-technical-interview
[5] https://www.careercup.com/page?pid=system-design-interview-questions&n=1
[6] http://highscalability.squarespace.com/blog/category/example