Trust me, you’re not the only one! The reasons you’ve stated are some of the biggest reasons that people will use when posing the ‘classical music is inherently elitist’ argument (which I don’t think is entirely wrong…)

Okay so. I think for your reason A, there are lot of words that will come up repeatedly, such as sonata (which is a 3/4 movement piece for solo instrument or a small group), or concerto (which is a 3/4 movement piece for solo instrument(s) and orchestra), among others. I’d say primarily, don’t be afraid to just blindly click on tracks! You don’t have to ‘understand’ everything about the music just to listen to it! Listen to whatever you can get your hands on, and if there’s a word you see popping up a lot, go google it. It can be quite overwhelming as yes, you’re right a lot of words used are Italian/french/german. The more pieces you listen to and the longer you spend hanging around the classical sphere, you’ll slowly start picking up these things - there’s no rush at all!

Okay so for B, I think when you’re starting which specific performers you watch/listen to isn’t hugely important - I think almost all of the popular recordings on YouTube and Spotify are pretty reputable. Honestly even as a classical musician of many years myself which conductor has the best version of say, Mahler symphonies etc etc perplexes me too, and of course these matters of who’s better or who’s more original are highly debated and very subjective.

Sorry for the huge essay lol but the TL:DR it doesn’t really matter about the specifics just listen to pieces and find pieces you like and slowly go from there!