I’ll take it from bottom to top, and answer your other questions in consecutive posts: for normal:
ctrl N to calculate outside, and Shift Ctrl N to calculate inside.
to see the direction they are facing, hit N key to get to your properties panel, and go to mesh display options…
(edit) and to flip them, mesh menu >> normal >> flip
border select: B key or ctrl B
snap UV vertex to another: Alt M
smooth UV: smooth selected UVs ( add-on )
snap origin to vertex: snap 3D cursor to selection in edit mode ( shift S ) >> go to origin menu on tool shelf ( the panel on the left ) snap origin to 3D cursor.
(edit) also you can change your pivot options on the main header of your 3D window.
2 more things how about when moving around a mesh…
basically snapping to another vertex while moving it around
and not sure whats the proper term for this
but basically in maya when i hold on to shift while moving uv vertex it keeps it as a 90 degree angle
well in case need to move uv vertex,edges or shells around in a perfectly straight angle/line