Hi Guys,
I'm a Product Manager who is recruting for FANG companies. I would like your advice on how to prepare for System Design Interview.

Background: I have watched videos to study various concepts and can design simple systems like Pastebin and TinyURL.

Challenge: I struggle with component design or deep dive of complex systems such as Instagram, Whatsapp, Uber etc. When I study concepts such as queue, I feel I know it but then later I see they are used in a manner that I am not familiar with.

Can you please share how to prepare further?
Appreciate your advice. Thanks