Only if you convert rubles by "purchase power parity" as opposed to the market rate, which seems like a weird way to manipulate data to fit some narrative.
No, you absolutely don't need to care at all about the memory management when using Linux. This rabbit hole is really only relevant when you want to work on the Linux kernel or do some really low-level programming.
I would say the most obscure thing that is useful to know for running Linux is drive partitioning, but modern installers give you a lot of handrails in this process.
Just wait until they figure out how much carbon is captured by planting a tree.