What is the best language / framework / stack that you can do work most or fast or most productive for a single developer . Python with django/flask , Ruby on Rails with ruby , rust with some frame work , Node js or something else. preferably with a easier learning curve .
Scenarios :
1. Webapps
2. Simple Website
3. Simple social media
One of the compelling reasons to write JS on the server was to have the same language and ecosystem in the client and server, and things like Turbo for Rails really go a long way towards delivering on that for Ruby (although of course you still need to understand javascript and browsers.)
That said, if you're already familiar with something else, then pick the most mature batteries-included framework in that language. Languages are just a tool for the job, it's incredibly unlikely as a solo dev that you can pick a "wrong" one.