First time buying tickets for austria gp..

Hello, so it's my first time buying tickets and there are a lot of websites with different pricing. It seems like the best deal is on the Red Bull Ring official site: https://www.redbullring.com/en/

But I would really appreciate if someone would be kind enough to confirm that this is all legit since the difference in pricing is not small and it's confusing. 🙏 Thank you!!