Relativistic equilibrium figures: stationary configurations of rotating fluids under the influence of of their own gravitation within the general theory of relativity, relevant for the modelling of neutron stars
Quasi-stationary routes to black holes: continuous transition from equilibrium configurations of normal matter to black holes (parametric collapse), relevant for the topic of "cosmic censorship"
Solution of the Einstein equations using the inverse spectral transformation: solution method from soliton theory, applicable to the vacuum Einstein equations in the presence of appropriate symmetries, relevant for black holes and gravitational waves
The book offers an easy to understand introduction to the special and general theory of relativity and shows a way how both topics can be integrated into the bachelor study of physics by default...