How to create a new application?

[uguraltinsoy]

I want to make a new application and share it to develop.pi, I created my application in develop.pi but what do I need to do to start a new project?
Which language do I need to develop with?
Which framework should I use?
Can I host it on my own website?
Is there a more detailed documentation or video?
Is there a discord or similar community channel for developers?