Read Volume 1 first. Use Volume 2 to specialize. If you cannot find Volume 2 on GitHub legally, buy it. The $40 is cheaper than failing a $500k/year Senior Staff interview.
Look for "System Design Interview" repos with high star counts. The "Discussions" or "Issues" tabs often contain deep dives into edge cases not covered in the text. Conclusion Read Volume 1 first
Mastering the System Design Interview: A Guide to Volume 2 and Online Resources Read Volume 1 first
Official/free resources for system design prep: Read Volume 1 first