Azure HA and DR Solutions

RJNIMP 

Hi i would suggest to definitely check the  Azure Well architected framework which  is a set of guiding tenets that can be used to improve the quality of a workload. The framework consists of five pillars of architecture excellence: Cost Optimization, Operational Excellence, Performance Efficiency, Reliability, and Security.

https://docs.microsoft.com/en-us/azure/architecture/framework/

If you like reading  there is a free ebook : Azure for Architects, Third Edition

Create secure, scalable, high-availability cloud applications

https://azure.microsoft.com/en-us/resources/azure-for-architects/

If you have a specific need i would suggest to draw a diagram and post it as png and everyone can give you an opinion on possible HA and BCDR scenarios