The physics of graphite intercalated compounds (GIC), in spite of the fact that these materials were synthesised quite long ago, is still the focus of modern theoretical and experimental research. The interest of the scientific community is focused on GIC, mostly due to the possibility of forming unusual superconducting (SC) and charge density wave (CDW) ground states. We focus on one of these materials, CaC6, in which experiments clearly demonstrate the existence of CDWs. The very existence of the CDW is quite unusual due to the fact that the graphene Fermi surface, chemically doped by calcium intercalates, shows no so-called "nesting property," i.e., no Peierls mechanism, which has been the paradigmatic mechanism behind the CDW instability since the 1950s and was experimentally realised during the 1980s in highly anisotropic materials with open Fermi surfaces. We show that the CaC6 Fermi surface undergoes a different CDW stabilisation mechanism based on the topological reconstruction (of the Fermi Surface) and critical strength of the electron-phonon interaction. Such topological reconstruction, which transforms the set of closed Fermi pockets into open Fermi sheets, has profound effects on transport and magnetotransport properties. In this thesis, we show how the Fermi surface reconstruction stabilises the CDW ground state. Furthermore, we present the magnetotransport properties, taking into account magnetic breakdown.