This design, known as the "Masu" box is the most common origami box around. I learned to make it in school, and having made many different types of boxes, I think this one is the best. Click here for video instruction.
"The origami crane is one of the most celebrated paper folding projects
of all time. It's often the first project that beginning paper folders
learn how to make once they decide they're interested in origami." - Dana
Hinders Dana Hinders from The Spuce Crafts, will show you how its done.
You can view the origami crane tutorial here.
I found a tutorial on how to make these 3D Origami Hearts which Jessica Jones shared on her blog called How About Orange. She learned how to make these hearts by following this video tutorial by Samuel Tsang.