Installing Service Packs

SUGGESTED

This is likely an obvious answer; however I want to confirm I understand how to install a service pack. What the documentation/videos have not been clear to me about is this: Do I need to install to the server first before installing to the clients? Does it matter? If I have 2015 SP8, can I install SP10 or do I need to install SP9 first, then SP10? 

This is my first update to BW and I don't want to assume anything. 

Thanks.

Heather