Web app

Question

I want to write web app.
Which programming language I should learn?

Answer 1

Note. Each item in a list is an option I all capped my favs

You must learn for frontend
1. HTML, CSS, JS
DB
1. Mysql
2. Postgres
3. FIREBASE
...
Backend
1. Flask
2. Django
3. Rails
4. Sinatra
5. Asp.net
6. Jsp
7. Firebase
8. SAPPER
...
Js framework
1. Angular
2. React
3. Vue
4. Polymer
5. Stimulus
6. SVELTE