The official Alpha phase, starting at version 1.0.0.
The earliest phase, initially called "Cave Game." Minecraft Alpha 0.0 0 BEST Download Pc
If you are looking for the earliest authentic versions of Minecraft (often called "Pre-Classic"), you can access them safely through official and community-verified methods: How To Play Old Versions of Minecraft The official Alpha phase, starting at version 1
“Understanding Software Versioning: What ‘Alpha 0.0.0’ Really Means and Why You Shouldn’t Trust ‘Best Download’ Links” The official Alpha phase