When I was in grade six, my teacher made us all learn about half a dozen greek or Latin roots each week. Incredibly useful, I still remember heaps of them decades later.

I read the entire Webster's unabridged dictionary one summer, with special attention to what the root words meant in the original ancient languages. I've only seen the word 'oedemic' one time but it was easy to figure out.

As a Romance speaker that's almost a builtin superpower.

That's what studying Japanese is like for Chinese speakers.