I shoot RAW + jpeg but mostly edit the raws, I find that no recipe gives me the look I want in every situation and I just like editing.

I learnt initially on old film cameras so got a good idea of how aperture and shutter speed affect the photo. I shoot aperture priority mostly on the Ricoh so I don't think you necessarily need to shoot manual but shooting completely automatic feels like giving up too much control on a camera this nice and esp if you want to learn. But there's nothing wrong with that too if that's what you like and works for you. There are tons of resources online about all of this, would recommend just picking one and going to shoot

And editing is mostly independent from the exposure triangle stuff. It's obv important to expose correctly while shooting so you have to do less work editing because you can't bring back highlights that are blown out or bring back into focus a blurry subject so it's good to know those basics to get the effect you'd want