Enter 38 catalogs on a website page and fix 4 mistakes, developing/coding needed. shopify

My website: [login to view URL] 1- Enter 25 catalogs on the page Catalogos. (this have to be seen good in desktop and mobile with the image like the one is already up.) 2- Enter 13 catalogs on the page Ofertas (this have to be seen good in desktop and mobile with the image like the one is already up.) 3- When you make the window smaller it seens like in the phone but when you put it big again (Mistake 3 image) this happen. 4- When you enter in any page inside ordenar a (mistake 4 image), the mini menu dissappear and the image that is set for each categorie/subcategorie or brand gets bigger(mistake 5 image). letting this image go in bad resolution. So i want all the ordenar por or selection of quantity to show(16 products showing), to stay the way it is when you first enter. Like image (mistake 5) 5- i want all this pages when you enter (categorie/subcategorie or brand) to show all the products possible in the case of my website the maximum is 16, its set to 6 but only shows 1 product (mistake 6 image). This to be made on phone and website. 6- add a brand to menu on menu dropdown on header and on mini menu. 7- add an about us (Quienes Somos) label to the header with the info i will give