This is absolutely fantastic! As someone who has always wanted to try generating my own environments, like this and Minecraft, where would you recommend I start

This is absolutely fantastic! As someone who has always wanted to try generating my own environments, like this and Minecraft, where would you recommend I start? I am a software developer, but have no experience with anything like this; I mostly do mobile and web apps (full stack). I just don't know where to start, where to "dip my toe in", so to speak. Is what you did here similar to how Minecraft worlds are generated? Thanks!