Make sure you have an option to remember the login

This is one of those features I would put in the list “Such an obvious thing that most people don’t think about it”, which is why I think it’s good to remind you of it here. If a user signs in, give them a little checkbox that allows them to remain signed in. It’s such a small thing, but it does a LOT for usability and user experience. Think about it, how many websites do you still sign into every time you browse to them?