You can use Paid Memberships Pro + WP Courseware together to provide a Udemy like courseware site.

You can host videos on YouTube or if videos are screen captures, encode your videos at 1000kbs + mono/128k audio + 15fps. This will produce HD videos which are very small.

This way you can self host your videos, which allows easier protection schemes + avoids expensive video services or YouTube Ads, which might be for competitors or just random + certainly will take attention away from your course.

Look at PMP + WP Courseware docs for how to associate videos with different membership levels + only allow people who've paid for specific membership levels to access related videos.

The paid-memberships-pro-for-wp-courseware plugin available at WordPress.org provides glue between PMP + WP Courseware, making using both even easier.

Keep in mind, depending on how many people are logged in to your site simultaneously, you can run into site performance problems.

Best to hire someone who understands tooling membership sites, to allow many simultaneous logged in users with no performance loss.

This type of site design is fairly easy to do from scratch...

And very difficult to do after a site is running.

Best to design your WordPress site based on expect numbers of simultaneous users.