What is Hawking's recently revealed 1965 PhD thesis about?

Theoretical physicist Stephen Hawking's 1965 PhD thesis 'Properties of Expanding Universes', which was made freely available for the first time, covers topics like Big Bang, gravitational waves, and singularities. Hawking showed how universe's expansion from a single point was physically possible and also credits Albert Einstein for describing how spacetime curvature is related to mass and energy.