You’re probably interested in full stack and infrastructure.

Look for resources on how to securely manage a Linux server (ssh, hardening, backups, VPS management). How to securely work with Apache and NodeJS. ( Scaling, TLS configuration, data sanitization). (Just examples of tools feel free to explore your options)

Massachusetts Institute of Technology (MIT) has a great deal of freely accessible learning resources. Give this a look through.

ocw.mit.edu