Here is Nikon's basic page on picture controls.
Picture Controls Step-by-Step from Nikon Photography Tips Techniques and Tutorials | Nikon Learn and Explore
As Nikon's page states: "With Portrait, you can adjust sharpening, contrast, brightness, saturation and hue (coloration) individually. Quick Adjust enables easy, balanced adjustment."
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Quick Adjust
Quick Adjust makes it easy to achieve well-balanced adjustments.
 With sharpening, contrast, and saturation, five levels of modification (-2 to +5) are applied automatically. Increasing a value on the plus side strengthens the characteristics of each Picture Control while movement on the minus side lessens the effect.
 Moreover, after using Quick Adjust, you can carry out finer, more detailed modifications to each item to suit your particular preferences and get the exact results you require."
One of the things that applying in-camera sharpening does is it makes evaluating the jPEG images much easier as far as spotting missed focus, or the difference between DEAD-on focusing, and just-so-slightly-off focus.
When you shoot a lot of volume, using the camera-generated JPEG files can tremendously speed up the editing process, by being able to view the JPEGS seen LARGE. The key is to shoot the in-camera JPEG files to a size that YOUR monitor can display at 100 percent--and NOT re-sized!!! This is important. Many times-re-sized images look "off". I suggest cranking the in-camera sharpening up to a fairly high level, so that the SOOC JPEGS are ready for on-screen evaluation with a really fast killfile/keep slide show viewing where the bad shots are IMMEDIATELY removed, and zero time wasted on those.
RAW + JPEG shooting in the B&W mode is a good time to actually set up a custom image set (Picture Style, or whatever your camera's manufacturer calls it), adjusting the sharpening, compression level, image size, and tone curve, so that the SOOC B&W JPEG files are actually useful. You can dick around later in RAW mode to your heart's content, but if you're going to shoot RAW + JPEG, you might as well do it right, and actually take a stand, make a commitment, and do it right, not half-assedly. That goes double if you're going to try and light and pose and shoot for B&W. In Canon, you have image toning, such as sepia, as well as filter effect parameters, and those make a big difference too.