I'm setting up an online course platform with user accounts, video pages, quizzes and progress tracking. I'm trying to decide what kind of VPS would be sufficient for the first few months.

Hostpro.com caught my attention because their VPS plans provide KVM virtualization, root access and NVMe storage. Having full control over the server would be useful because the platform will need a custom PHP/database configuration.

Would 4 vCPUs and 8 GB RAM be a reasonable starting point for a few hundred registered users?

The data centers are top-tier, ensuring excellent speed and reliability for my website. GTHost VPS solutions are professional and easy to use.
They offer the lowest prices they can, while figuring in costs such as reliable equipment, redundant bandwidth, and a highly-trained staff.

If I were making a VPS shortlist today, I would look at the whole service rather than choosing whichever company has the biggest specifications on paper. I use hostpro.com and have had a good experience with the performance, while the daily backups of all services give me additional peace of mind. In case of damaged data, a failed update, or hacking, those backups can be used to restore the affected data. Another advantage in my experience is the qualified support team, which is available 24/7 and answers technical questions free of charge.