What are the best settings to use with the SB 400 flash for indoor portrait photography?

For indoor portrait Photography with the SB 400 flash, it is recommended to use a low ISO setting (around 100-400), a wide aperture (around f/2.8 to f/5.6), and a moderate shutter speed (around 1/60 to 1/125). Experiment with these settings to achieve the desired lighting and depth of field for your portraits.