Hi Jacques,
If you are asking in the context of templates to build the Azure Landing Zone (Initial foundation), you can review available templates here. https://github.com/Azure/Enterprise-Scale/
It's a work in progress but landing zone Bicep samples are available here https://github.com/Azure/ALZ-Bicep
Please note that there are different scenarios of reference implementation and not all scenarios will fit all environments.
You can also find template references under individual service documentation. For example, for Virtual Network. https://learn.microsoft.com/en-us/azure/virtual-network/template-samples
There are some samples under ARM documentation https://learn.microsoft.com/en-us/azure/azure-resource-manager/templates/