After Back End, what should I learn for Web Hosting/deployment!

I just created my own Node.js dynamic app with ejs, express and I also created an app with php.

Now I am at a point where I want to develop further my knowledge and there are many options for web hosting/deployment and do not know what to choose.

Should I learn:
Google Cloud? Amazon Web Services? Linux Sysadmin? Kybernitis? Jenkins?

What’s next?

Don’t run after technologies. It is better that you get a command in some 1 or 2 technologies, instead of learning bits and pieces of many.