Full Stack and UI Design

I'm new to this community and really appreciate anyone who takes the time to read!

I am pursuing a dream to build a website that I would describe as very robust (maybe it's not). The site will create a user experience where specific members (with username and login) would be able to contribute specific content, much of which would require "building" through a drag and drop feature, labeling different parts of what they have built, and then submitting the information, which would then become part of the site (like a wiki).

Is this complex? Is this considered UI or UX? Both or neither?

I know this is vague. I'm also learning to navigate this culture and making sure to protect my idea. If that seems naive or unreasonable, please remember I'm new here :)

Please ask questions!