/jp/ - Otaku Culture

Guys Im doing the core 2.3k deck and im worried about pronunciation of the words.

Ex:
2.3k deck:
1.凄い sungoi
2.姿 sungata

Jisho:
1.凄い sugoi
2.姿 sugata

What should I do? Should I pronounce the words as core 2.3k deck says to and fix later on? If not what should I do to get the correct pronunciation of the words in the deck?

I feel like a lot of japanese words have a hidden ん in them.
Ex:
1.凄い
2.姿
Should I remember and pronounce the ん sound while reviewing?