Free Resources
- https://github.com/shashank88/system_design
- https://github.com/madd86/awesome-system-design#articles
- https://github.com/donnemartin/system-design-primer
- https://www.freecodecamp.org/news/systems-design-for-interviews/
- Youtube — lots of informative videos are available my favorites are Sandeep Kaul(https://www.youtube.com/watch?v=CUwt9_l0DOg) and Mikhael Smarshchok(https://www.youtube.com/watch?v=bBTPZ9NdSk8&t=2s)
- Mock interviews are really helpful. You can use Pramp https://www.pramp.com/#/ for practice before your actual interviews.