System Design Preperation

To all the people who were able to crack their system design rounds -

please suggest the resources they utilized for the same

I am aiming SDE 2 in product base companies.

Also if possible share the lld and hld resources seperately.

Since I am a beginner I want to know what should be the sequence lld to hld OR hld to lld

my Tech domain - java dev, 4.5yoe