I'm looking for a single source of true, regarding where can I get all current macOS versions. If I search Google I see a WiKi page with a list, but I cannot trust WiKi page, I'd better trust Apple with versions, builds, release dates. Is there a resource like that, which also gets all the latest versions as they are released?
What do you mean by "Current" versions ?
Could this help ? https://support.apple.com/en-us/HT211683
For the latest versions, you have : https://developer.apple.com/download/
But may be I missed something in your question ? Why do you bother about those old versions ?