Clicking document link and back to original link location

Are you talking about a cross-reference link?

If so, there are a couple things you can do. There's a Cross-References pod (View -> Panels -> Cross References) that gives you a listing of all cross-references in a document or all open files or, if you choose a book file, all the cross references in the book.

It gives you the information inserted into text, where the cross-reference is inserted, and what it refers to. 

Or you can keep the Cross-Reference window open and after you get to a reference, you can click (BUT NOT CTRL+ALT+CLICK) on it you can then click on Go to Source, which is next to the field identifying the document name and it will take you there.

Either way should give you the information you need. The Cross References pod (1st image) will also show a little red X to the left of the cross-reference text if the link is bad.

re: I was wondering if there is a button or way to go back to the original location of the link I clicked on.

In what context? In FM edit, PDF viewer, HTML browser, eBook, XML?
In PDF, for example, the viewer can usually be enabled to provide a back button.
If only one spot ever references the target, you can add a return link at the the target, but that's usually not the case.

Not that I know of.