Basic backend understanding for Vue/React developer?

Question

React

Please tell me about the backend for javascript applications.
I started writing a small simple application similar in functionality to todo lists and I don’t understand how to save the entered data
The user has the opportunity to create his own list, while only 4 data fields are entered in the list element:
1. Title
2. Date (still just in text format)
3. Available amount of money (just a number)
4. Required amount (also just a number)
Actually, that's all, a simple application that calculates the number of days until the goal is reached.
In principle, one could take WordPress, because. he is familiar to me. But most likely, no one does this on the bulk of projects and does not take WP as a backend.
I would just like to know in the future what is used in real projects mainly and what to pay attention to

Answer 1

Real projects usually use REST API .
For your application, local storage is enough .
You can use firebase .
At the very least, you can use the REST API plugin for WP.
You can try to write a simple REST API server in Epress/Koa or any PL suitable for this task.