Preparation Tips For SDE3

A friend of mine is working as an SDE 3, 7 YOE at a US listed firm.

Looking to switch after having stayed at the current firm for 4.5+ years.

Would it be possible for some kind folks to share some good preparation resources/guidelines?

Additionally, if there are podcasts/blogs that you feel are helpful to stay in touch with the latest trends then please do share that as well :)

TIA!