I'm setting up a SharePoint 2013 site for my employer. I was told that you could set it up such that employees can upload and tag documents. Then, you could set up custom document lists that pull documents that have certain tags associated with them. For example, let's say an employee uploads "Expense Report.xls." He should be able to tag it "expense reports" and "manufacturing division." Then, when he clicks the link to go to the Manufacturing Division page, there would be (among other things) a document webpart that lists all documents tagged "manufacturing division." If he did a search for "expense reports", this document should come up as well.
However, I'm not seeing how to set this up. All I have is a single "Upload Documents" webpart that doesn't allow tagging, custom views, or searches. What am I missing?