I'm looking for some information on creating a portion of my website that is only accessible via client log in. I would like for clients to be able to purchase an online learning course, then log in to view the courses they purchase. To complicate things further, I would also like clients to only be able to view the content for a specific period of time. Any resources you could provide me would be great!

I'm sure there are different posts on the forum about this sort of thing, I just really wasn't sure what keywords to search for. Any help would be appreciated.