ASP.net web application with Angular - how to

probably this question has been asked by many people, but I find it so difficult to understand how both can be made to work together.

I am currently working on a web application, I have got a web form with some .net controls. I have programmed a web form to load a gridview pragmatically from code behind, there is a specific column in the gridview that contains a textbox control. Now, I want to do something like, when user hover's a mouse on the textbox, a popup window should open contains checkboxes that pulls data from a database ( of course the checkbox containing the value from the textbox should be auto selected ). I know this is possible, but I want to learn angular and I want to implement it using angular, but I am lost.

Are there any tutorials that I can learn from, also, what does Angular CLI do, node.js ( must I use this, since I will running it from the IIS server ), why are the folder hierarchies for angular so confusing.