Ask HN: Learn (Linux) Embedded Development in 15 days

Hi folks, I'm a junior dev that's been unemployed for some 5 months now. I've got an interview for embedded dev position two weeks from now, hence my clickbaity title. Acknowledging it's a long shot, what is the best area to focus on, bang for buck?

I know some C, and I know they're big on networking stuff. There is some talk about Python and Qt. Do I focus on learning assembly, on OSDev or tinkering with a microcontroller (like in Rust's https://docs.rust-embedded.org/discovery/), more C?

Thanks to anyone that can pitch in. HN has been part of my code learning ride, mostly in the positive way :D.