What do the tools in options panel( like Tag Bevel )in edit mode do? I was trying to get to know everything in Blender and I came across the options tab in Edit Mode and there's whole bunch of options like Tag Seam, Tag Bevel etc.

I know how to use all the suffix functions (i.e every tool without "tag" ).But I am wondering if this has any specific function/usability.

So, if anyone has any idea can you please explain all those options(Tag Seam, Tag Sharp, Tag Crease, Tag Bevel)? Thanks.
The options in the Options Panel for tagging edges are the same as the edges menu with only a slight difference that I can see. Most notably in Bevel and Crease, in that the weight added is always at 1. 


Crease marks edges for use with subsurf, with a weight of 1
Bevel marks edges for use with Bevel modifier, with a weight of 1
Sharp will mark edges sharp for edge split modifier
Seam will mark seams for UV unwrap
Freestyle Edge Mark will mark edges for use with Freestyle


To use the Tag Bevel, Tag Crease , Tag Sharp, Tag Seam tool, it is as simple as selecting each edge with Ctrl + RMB