This thesis studies the properties of the Higgs particle discovered at the Large Hadron
Collider (LHC) in 2012 in order to elucidate its role in electroweak symmetry breaking and
cosmological phase transition in the early universe. It shows that a generic spin-2 Higgs
impostor is excluded by the precision measurements of electroweak observables and perturbative
unitarity considerations. It obtains LHC constraints on anomalous CP-violating Higgs-Top Yukawa
couplings and examines the prospects of their measurement in future experiments. Lastly it
discusses in detail the electroweak phase transition and generation of cosmological
matter-antimatter asymmetry in the universe with anomalous Higgs couplings.
