The highly respected Job Snijders just hosted a very easy to digest webinar (assuming basic level understanding and experience in deploying BGP) on the overview and practical concepts of RPKI based BGP origin validation. I think it is a great for people who want to get their feet wet with the technique. You can watch it here (about 1 hour) https://www.capacitymedia.com/community/webinars?commid=396013 Also, for those using Arista, they recently added support in EOS for this and here is one document they put together on the topic as well: https://eos.arista.com/bgp-origin-validation-rpki/