How do you do box braids?

Can someone please supply me with an easy tutorial or pictures on how to box braid with adding hair into the braid? My daughters hair takes forever to grow and she’s sad, but wants long hair. I bought 6 bundles yesterday of hair. And I’m struggling so bad getting it tight to her head. They droop. I took them all out today, and she’s sad. I want to do it right, I’m YouTubing and googling but need some help with better links and such. I’m a visual learner 1000%. But they don’t show enough.