After sauteing ingredients and before pressure cooking you need to deglaze the inner pot. Deglazing involves adding a thin liquid like wine, water or broth to the hot surface and scraping the bottom with a silicone scraper or wooden spatula to remove the caramelized and brown bits that are stuck.

Deglazing adds wonderful flavor to your dish, but more importantly, it cleans the inner pot. So any liquid that you add will make full contact with the bottom of the inner pot and that allows the sensor in the Instant Pot to properly register temperature and pressure + the stuck-on bits will not burn during further heating.