Whether you are deploying Database or Application on Cloud, the very first thing you will do is create a Network (VCN & Subnet).
You then will decide which part of Application/Database is in what Subnet, What Ports to open across Subnet, How Primary Database talks to DR, Where to Deploy Load Balancer for HA & Networking across Region.
Networking is important for almost everyone working on the Cloud.
Check https://k21academy.com/1z093213 if you should learn too, by knowing:
✔ Basic concepts in Networking
✔ Who Should Learn Networking & Why?
✔ What to consider when deploying Application or Databases on Oracle Cloud ..