Help regarding ADDONS working and creation

I was trying to create an addon where users can interact with the addon page when editing any post/page...
But i am stuck at following things:-

  • sidebar interface for user to add texts which i can process [during user editing the post]
  • storing keys
  • get the user contents for a particular post

rephrasing it for better understanding:-

  1. I want to show an interface typically an input field to the user while editing the contents (post/pages)
  2. I want to store some keys taken from the user

I think you need a form and an annotation storage. For Classic-UI:

This is a starting point but can help.

In that case your package would be a Behavior that you can assign to your content types.

I would recommend that you work your way through the training to get a more solid understanding of Plone architecture as a whole.