how i can learn about saas multitenant application like shopify?

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now I have an application and want to deploy it as a multitenant app (from the perspective of a DevOps) for companies and individuals with Kubernetes or other tools. but I don't know where to start or the architecture that I should follow and there are no resources on udemy or Coursera that I can buy to help me.

buy saas I mean a web application like shopify.com

I have tried a lot with many sites but I cannot find any useful info.

Link