How do I go about using a server to store and retrieve data?

I have the task to implement a server into my Unity game w$$anonymous$$ch I must use to store and retrieve data. The t$$anonymous$$ng is, I know not$$anonymous$$ng about servers and online databases. Where do I start? And what are the steps I need to stake to just store and retrieve a couple of stats from the game?

Here is the task:

"T$$anonymous$$s is similar to Leaderboard, but the saved data must go on a server somehow. Integrating with Google Drive, a database, or even a simple Node.js server that keeps track of stuff in an array are all valid methods. The server/database does not have to be persistent, we just need to see that data is being passed off to a foreign location where it will be held until requested in the same session. Don’t worry if the server happens to be running on your local mac$$anonymous$$ne. It’s very common to have both client and server running on the same developer station when debugging."