I have no idea what modular pages are! help?
Modular pages it’s a great function coming with Grav, you can have a multiple views into one template, if you want see you can view the Grav themes released by me, all new themes use a modular system 
Really they are a way to build complex pages by stacking ‘modular’ pages on top of each other and rendering them all out as a single page. see the getgrav.org homepage or the on page skeleton of other examples.
how do you stack multiple modular pages on top of each other ?
I mean how to collect all the modular pages in one place in a page?
Like I said, download, install and inspect the “onepage skeleton” package. It will answer your questions easier than me explaining Just look at the pages, and the corresponding modular templates in the Antimatter theme.
okay thanks 