In the book by wattpad: Just Write It:Guide
A person says in that first sentence that you need to show who your book is focused on or if your giving 'the camera' the privilege to move around... no! In many of your fantastic wattpad books people begin their first sentence like...

I ran ,tears slipping down me I ran to Dan's house!

Then later in the book you switch camera to Dan or pewdiepie! I do agree that its good to decide who your books focusing on but, you don't have to, many of LexiBunnyMCs
Books are like that but that doesn't make them bad. It makes the people who like that kind of writing like that book.

So it is okay to change POV (point of view) in the middle of a story as long as the story is good.

As long as you make it clear who's POV you have changed too and you have done it tastefully I don't think they're a anything wrong with that.

It's like a tv show.

You don't always follow Ted (How I Met Your Mother) around. It switches to Barney or Lily's POV.

I hope this was useful.