# Weekly Tech Update #20

This week's featured links:

-  [HTTP/3 From A To Z: Core Concepts](https://www.smashingmagazine.com/2021/08/http3-core-concepts-part1/)
-  [The New Go-To-Market Playbooks for Digital Health Startups
](https://a16z.com/2021/10/19/the-new-go-to-market-playbooks-for-digital-health-startups/)
-  [The C4 Model for Software Architecture
](https://www.infoq.com/articles/C4-architecture-model/)