What are some resources that teach how to work with layouts?

Question

Adobe Photoshop

I used to create all sorts of business cards for myself out of my head or draw on a4
. Here I had the opportunity to make layouts according to the layout in .psd, but I had never seen layouts and photoshop before. What can you recommend for review and where it will be explained in an accessible way, how to shred
, cut, etc.)