Techstack to host a small webapp on a raspberry pi at home?

Hey guys,

I want to do my first little project. Asking the title question probably means I'm in over my head, but we shall see!

Here's what I want to do: On my raspberry pi 4 B 4GB (currently only running pihole), I want to host a small webapp to track game statistics for a game I play with friends somewhat regularly.

There should be: Authorization (login form), a database to keep track of the games played, a simple UI where a ranking and other stats are displayed and a form to enter new games.

The only thing I have experience with is SQL, Python and FastAPI (very little). The raspberry pi is running ubuntu server.

SO, what do I need to look into to get this off the ground? Here are my thoughts so far:

Docker to have everything working together and easy to deploy.

Cloudflare DNS so as not to expose my home network IP to the internet.

SQLite as a database to keep the game records.

FastAPI to handle requests.

React for frontend (also to learn about Javascript)

Nginx as a reverse proxy (not even sure what this means)

Am I missing something? Is what I want to do possible only with the technologies I listed?

Also, could you give some general advice on the security aspect? What do I definitely have to do so as not to endanger my home network? The webapp is only to be used by around 10 close friends.

Sorry for all the questions, I hope this is the right place and not too much.