Casual Home5-Shelf Ladder Bookcase,72-Inch, Espresso

What are the dimensions depth of each shelf and the distance between each shelf?

I live in an apartment & cannot put holes in the wall, do you have to nail or secure it to the wall? Or is it sturdy enough leaning against the wall?

Can anyone please provide the dimensions of each shelf of the 5-shelf corner bookcase? thank you.

Is it made wood or composite wood?