With the increase of proton-proton collision center of mass energy from 7-8 TeV to 13 TeV, LHC Run 2 will provide a higher sensitivity to Higgs boson physics than Run 1. This paper summarizes what has been learnt by the ATLAS collaboration about the Higgs boson with LHC Run 1 data and also reports the first investigation of global properties of the Standard Model Higgs boson production and decay properties extracted based on a LHC Run 2 dataset using a combination of the two Higgs boson decay most sensitive channels at the LHC. This latter analysis combines a dataset of 13.3 fb−1 H → γγ events with 14.8 fb−1 of H → ZZ∗ → four leptons events. No deviation from the Standard Model expectations is observed.