I am preparing for tech interviews and I wanted to understand the basic of sys design. My question is, should I memorise the key concept for each system (after I understand it) ? Typically I forget things if I am out of touch within just few weeks. However, I do retain it for a way longer period if the concepts have been memorised. Another thing, how long should one take to finish up this course.

Aside from that, can you guys have a feature where we can post questions in the discussion as anon and maybe allow us to rename ourselves ?

Thank you !