For sim, I utilize iRacing to practice and learn tracks before real life amateur endurance races in champcar and lemons as well as track days.
IMO iRacing physics are so good and the tracks are so well modeled that it’s a very effective learning tool. It’s the first sim since Live For Speed that really feels close enough to real life for me to forget I’m playing a sim.
Plus traffic management and race craft are so crucially important in wheel to wheel racing & I simply don’t get any other opportunity to practice those.