What are things? How do you make one? Why is it there? I don't understand (￣∇￣")

This is the most I could help with (for now) sorry. It will be too complicated if i just write it without using illustrations.
https://www.mangago.zone/read-manga/mangago_how_to_guide/uu/br_chapter-6837/pg-17/

I will be making a tutorial guide soon when I get time to spare :<
https://www.mangago.zone/read-manga/mangago_how_to_guide/uu/br_chapter-7868/pg-1/