Diagrams usually improve the quality of a conversation. I love the examples Nehali, and other contributors, are creating in Draw.io in her GitHub repo here. Draw.io is a little heavy for my day to day use case. The Draw.io layers are great for stepping through a scenario but I'm often mapping out a new architecture or troubleshooting.
I decided to build my own templates based on my conversations with customers. I'm using Excalidraw.com because it's easy to use and share with others. You can launch Excalidraw as a progress web app (from Chrome or Edge) and pin it to your taskbar. There is also a VS Code plugin so you can easily edit multiple diagrams at the same time.
A few people encouraged me to share my templates so I'll upload them here as I clean them up.
Azure Virtual Networks in a traditional hub and spoke model. A few high level variations with and without firewalls. Another with ExpressRoute connections in more detail.
Private Endpoint examples in vWAN and hub-n-spoke environments.
Azure vWAN with and without a firewall. This diagram includes traffic flows for various scenarios. A separate diagram with more ExpressRoute connection detail.