How do I ensure that my project is a ColdFusion Project in ColdFusion Builder?

Questions about ColdFusion Builder or possibly ColdFusion in general. I'm trying to wrap my head around Projects and Workspaces. With Java, there's a directory-namespace hierarchy that associates programs under one package. I'm simplifying it, of course, but having this structure allows me to share code within one package but I'm still unclear how that works with CF.

I incorrectly imported a CF project into CF Builder using these steps: https://stackoverflow.com/questions/10488276/coldfusion-builder-open-project. Now CF Builder says that my project doesn't belong to a CF project and tried to follow these steps to apply CF Nature to the project (https://helpx.adobe.com/coldfusion/using-coldfusion-builder/managing-projects.html#Importexportanddeleteprojects) but error message says "Project is already open in the workspace." So now I'm confused because I'm told that my project isn't and also is a CF Project? And why would it make a difference if it's open in the workspace? What's a Project and what is a Workspace? How do I check to see if something is a Project because I assumed that if it pops up in the Navigator panel I successfully imported as a Project, but the error message stating that it doesn't belong to a CF Project proves otherwise?

Many  thanks for any information, please, and apologies if these are a lot of questions. Wasn't quite sure how to ask or if there are proper terminologies that I should be using or if I'm asking the right questions.

OS: MacOSX Mojave 10.14.4

ColdFusion Builder 2018: Version: 3.2.1, Build: 313943

Message was edited by: Thuy Ngo