1. Roll your R’s.
To speak proper Polish, you need to roll your R’s. All the other kinds of R’s don’t count. Need an example? Czarna krowa w kropki bordo gryzła trawę kręcąc mordą. Alternatively, try listening to Shakira’s “Rabiosa” — that’s how you pronounce it. Polish people swear a lot and, as they saying goes, you can’t swear without a properly rolled R.