Isn't the answer with METEOROLOGY to understand it? We are not talking about "black hole" theory; but it does require basic success at school (UK) O/GCSE/National 5 prior to A/Highers.
The 'theory' part is applied physics. Boyle's law: Chales' law. The relationship between pressure, temperature, & density.
The climateology. Don't learn it like a history book (apart from monsoon dates) but understand the seasonal variations with the movement of the sun. Then "join up the edges" of the regions. There is a logic to it. Get your head around that and the learning flows.
The practical stuff, TAFs METARS etc also have a certain logic to it.
Don't think about QBs until you have learnt it. Learn the logic and life becomes sooooo much easier.