https://github.com/donnemartin/system-design-primer
https://medium.com/always-be-coding/abc-always-be-coding-d5f8051afce2
https://www.bigocheatsheet.com/
https://www.students.cs.ubc.ca/~cs-490/sec202/notes.html
https://www.codechef.com/LEARNDSA?itm_campaign=contest_listing
https://www.fullstackpython.com/
https://fedakv.medium.com/top-10-devops-courses-that-merit-your-attention-cfea2f45b4d7