[TheGlav]

No joke: just start!

Learn C and C++. Find a cheap micro pc board, pick one of the embedded linux distros that run on it, and make something with it.

Repeat until you get bored, exhausted, or a job. :)

[bluGill]

Make sure you touch a little rust too. C and C++ are still big, but embedded is interested in Rust as a potential mitigation for issues they have.