Restrict content on a Wordpress site

Add custom restrict content functionality to a page on a Wordpress website. There are three courses on a page on a website. These courses are just lists of Youtube videos on the page - this is hardcoded and not dynamically added by another plugin. Course 1, Course 2, Course 3. All three courses will appear on the same page. In order to see these courses on a page, a user will need to have a valid email address that matches an email on our list of approved emails. Each email address will have access to a certain course. Some email addresses will have access to course 2 and course 3, but not course 1. Some emails might only have access to course 2. In other words, make sure it is possible to assign one or multiple courses to an email address of our choosing. 1. Create a login form that only requires an email input. NO PASSWORD required, just an email address. After the user enters a valid email address that matches an email on our list, redirect them to the course page. If the email does not match an email on the list, display an error message and do not redirect them to the course page. 2. On the course page, show the user the course they have access to. The admin does not need a UI to add the list of email addresses for a particular course. This can just be hardcoded. Keep this as simple as possible!