Looks like a great resource. There does not seem to be anything on database connections (e.g. MySQL, PostgreSQL etc) and related topics (e.g. building a CRUD

Looks like a great resource. There does not seem to be anything on database connections (e.g. MySQL, PostgreSQL etc) and related topics (e.g. building a CRUD framework). Are database connections only considered in a client/server context (e.g. through Node.js)? What am I missing? How does the IndexedDB section relate to these considerations?