PHP vs Python vs Ruby

I've been juggling with an app idea and am clueless about how to build it.

A little about the app:

• Social network type app ,
• Users can create different directories, in those directories post images and/or text that'll be shared on a public dashboard .

Directory creation is the main point of this app. Besides there'll be rooms(groups),chatting system, search operations similar to instagram,push notifications

I have two options:

1. React Native, Python, AWS stack or
2. Flutter, Go ( I don't know what stack or tools to use)

We decided to use python to write our ETLs and import them into metabase via a lambda. Before python we tried using Go, but overall go was way more verbose than Python when writing the ETLs. Go also had some issues managing memory when using the S3 upload manager library. This was a deal breaker for us that made us switch to Python.

In the end the solution was much cleaner and maintainable.

I am a newbie to StackShare and the GitHub community. I want to understand how to use an include statement to get a collection of Markdown files to create a book. I have been told that there are a number of useful tools. My problem is that npm and Node.js are also very new to me. Any suggestions on how to get my md chapters into a printable document would be helpful.