_:n4b5171bbd72f4b5f89e225fd67be6545xb0
<http://schema.org/publishingPrinciples>
<https://www.digitalocean.com/community/tutorials/technical-recommendations-and-best-practices-for-digitalocean-s-tutorials>
<https://www.digitalocean.com/community/tutorials/how-to-use-indexes-in-mongodb>