So i have seen numerous vids about Lagrange points, but none have explained why the need to actually orbit around it (L2)? There's no mass to orbit around...to me it's just a fairly stable point in space from a gravity standpoint.
The mass that the JWST orbits at L2 is the Sun and the Earth. It's actually considered an unstable lagrange point. The JWST is in the L2 because the Earth keeps it in the shadow of the Sun, less interference.