One of my favorite things about writing is switching up the protagonist. So, what does that mean, exactly?
As you know, most books have a protagonist. Sometimes it is more than one character, but most times, there is one main character that the reader follows throughout their journey together. The great thing about this is that you can get an in-depth, personal understanding of that character. The not-so-good side is that you only get that character's perspective; therefore, it may need to be more accurate. Occasionally jumping to another protagonist allows you a broader view of the story. Think of it like talking to two friends about an argument they had as opposed to just one of them. One person may only mention some aspects of the argument, giving you a limited view of the scenario. Hearing both sides allows you to see both perspectives, allowing you a much greater understanding.
To have a better understanding, check out this video.