Digraph
How to pronounce Polish «ni» [ɲ]
ni
IPA[ɲ]
Before a vowel soft ń is spelled ni: niebo = ń + e.
How to shape the sound
A mid-tongue nasal [ɲ], close to Spanish ñ or the “ny” in canyon: the middle of the tongue moves toward the hard palate.
Common trap
East Slavic speakers usually find this easy: a similar soft nasal exists in their native language, so there is little to relearn here.
How to fix it
Just avoid turning ń into a hard dental n: dzień, koń, słońce, pani.
Practice words
Pick a teacher — the word plays in their voice · Mirosław
niebo
sky
Focus on pronunciation «ni»
konik
pony
Focus on pronunciation «ni»
pani
madam
Focus on pronunciation «ni»