There are some specific techniques for stealth, but the ability to do them comes from practicing taijutsu, so people who don't know they are practicing stealth are still building up the skill to use the stealth techniques. What you will find in a typical ninpo dojo is learning to fall and roll, unarmed techniques, weapons techniques, and techniques to counter weapons. Pretty much everything else depends on the instructor. Some instructors teach many of the things ninja were famous for and others don't. All the skills depend on taijutsu though, which is what everyone should be focusing on.
