Measurements and searches of Higgs boson decays to two fermions and of Higgs boson production in association with a ttbar pair at the ATLAS experiment

Testing the couplings of the Higgs boson to fermions is an important part to understand the origin of fermion masses. The talk presents cross section measurements in Higgs boson decays to third-generation fermions, as well as searches for Higgs boson decays to second-generation fermions. It furthermore presents the analyses using Higgs boson decays to bbbar pairs, to two Z bosons, to other multi-lepton final states, and to a pair of photons. All analyses are based on pp collision data collected at 13 TeV.