The traditional way of learning to sing is to find a vocal coach, commute to lessons, and (hopefully) find time to practice on your own.
But what if you're super busy and can't attend weekly lessons?
Or what if you don't know what to practice?
Sure, some vocal coaches might provide you with an audio or video recording to help you practice a specific area of your voice.
But what if you don't know whether you're practicing correctly, or you're stuck on knowing how to apply what you're practicing to songs?
The last thing you want to do is practice the wrong thing (or not practice at all), get frustrated and waste the precious time, effort and money you've spent on your lessons.