/n/ is a voiced consonant sound.
To make this sound, put the tip of your tongue on the roof of your mouth behind your top teeth.
Use the voice and make the air through the nose.
It's pronounced /n/...../n/.

The sun shines.
/ðə sʌn ʃaɪnz/
The thin man is an African dancer.
/ðə θɪn mæn ɪz ən ˈæfrɪkə ˈdænsər/
Tony has taken the train.
/ˈtəʊni həz 'teɪkən ðə treɪn/
Nancy has many new friends.
/ˈnænsi hæz ˈmeni nuː frendz/
I haven’t eaten a banana.
/aɪ ˈhævnt ˈiːtn ə bəˈnænə/