If you want to go past some simple control, you're going to need an HA hub. Once you make that decision you're going to be tinkering and having to learn the system. It's up to you how far you take it, most here have things working then get the ich to automate or control something else. Each thing you add is a new adventure and learning experience.
I believe having done it before and migrating to Hubitat from another system might be harder in some regards. You have to unlearn and retrain your brain and way of thinking. Starting out new to HA you can learn the Hubitat way because no matter what system you get you'll still have to learn a lot.
Just start slow, get some basic stuff working, enjoy that for a while before going further. Add a light switch or dimmer module and motion sensor and Alexa integration, get that working first.