Dynamics of the Expanding Universe

Contemporary cosmology is based on understanding of the dynamics of the Universe, in terms of the General Theory of Relativity, under the strong simplifying assumptions of global homogeneity and isotropy. Here we deal with general questions, from the derivation of the FLRW metric to understanding of its dynamics with its many variants and (apparent) paradoxes, but without restricting ourselves to specific material content of the Universe. The second part provides a digest of General Relativity, which is necessary to know in order to deal with the majority of the whole collection of problems.