Can we make portrait and landscape pages inthe same document?

Answer 1

Yes. You can insert section breaks. Formatting in one section can be independent of the others. So you can different sections with different page formatting. It can get complicated and messy, so sometimes it is better to do it in separate documents, unless they have to be part of the same one. It would be unusual to have a lot of both types, although it can happen. You could have diagrams that are on landscape pages and text on portrait pages. That involves a lot of section breaks. As a simpler one, you might have something like a Portrait cover page to a document that is all Lanscape pages. So you could have it as the first page and then insert a section break and change the page layout and continue on with the rest of the document.