What is the most important content stored in the page table entry?
in the page table entry every single entry such as valid/invalid, protection, reference, caching, and dirty all this are optional and can be present or absent but on the other hand on the first part of the page table frame no.must be present and is mandatory thus Frame no. is the most important content in the page table entry
generally depends on the operating system implementation but a page table must have a mapping from page number to frame number. so frame number can be considered one of the most important in page table.