2 Yrs Old WAY harder than I thought

I (m26) have a 2 year old and he is my whole world. I will change my habits and techniques in ANY WAY possible to make sure I’m giving him the parenting he needs. But man, I feel like everything I try makes the day end in 30-40 minute tantrums. My wife and I have worked to make sure he has little to no screen time. We have been watching some super nanny to learn a base discipline routine. I’ve been trying to learn a little about the different parenting styles and sometimes it feels like everything I try can end up scarring him. He’s still only understanding some words but it seems like he doesn’t understand full sentences yet I don’t think. My wife and I really stressed and would appreciate any advice. He’s been hitting, screaming, throws toys, and sometimes it feels like any false move on my part will trigger him to become angry. I keep a low voice and present myself as calm and collected. But it feels so hard when communicating is at such a minimum.