How to make a hierarchical categories of a view's nodes? I want to have hierarchical categories of a view's nodes,where categories will be taxonomy terms of the nodes.How to do that?
If you want to display your taxonomy as tree, and insert nodes having given term, into that tree, you'd need Views Tree. This adds a display plugin for Views. You just need to create a node listing view which accepts a term argument.

If you mean to format the term attached to a node, as a hierarchical tree, try Term Reference Tree.