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The Higgs mechanism describing electroweak symmetry breaking is at the heart of the Standard Model of particle physics. The past decade has seen dramatic progress in the characterisation of the Higgs boson. Early searches have evolved to precision measurements of its mass, couplings to gauge bosons and third generation fermions, and total width. These breakthroughs were enabled by state-of-the-art tracking at the heart of event reconstruction in ATLAS and CMS. Further advances in understanding the Higgs sector, including the second-generation fermion and self-couplings of the Higgs boson, will be possible with data yet to be recorded during the ongoing LHC Run 3 and at the High-Luminosity LHC. However, maintaining the quality of track reconstruction required for precision measurements under ever increasing pileup is a tremendous challenge. This seminar will present recent highlights of ATLAS Higgs boson measurements with an emphasis on the “golden channel” H-> ZZ* -> 4l and highlighting a novel search for CP violation. The challenge of high-pileup track reconstruction will be discussed using the example of ATLAS tracking under Run 3 conditions. The seminar will conclude with an overview of the ongoing developments towards tracking at HL-LHC and the exciting opportunities presenting themselves in this area of research.