This article will contain a lot of code snippets. All code is retrievable here: https://github.com/fulviodenza/cognito-golang
This is not production-ready code, you should add some other checks, wrap errors from Cognito to make them less user-affordable, integrate Cognito with Amplify and other things we’re not interested in.

If you have a static website and you want a simple solution, S3 and Cloudfront are great choices. Also, we will get an SSL certificate for our domain and it will be free.