A way for new players to learn mechanics

So there are a lot of mechanics in Minecraft, some are not obvious, and one good thing about games is immersion, such as, not needing to leave the game or do something outside the game to learn something new, like reading a wiki or watching a YouTube video, and i think Minecraft lacks that, so how about we can have some kind of free in-game codex/book or even subtle ways like paintings, structures and caves to make new players learn new mechanics. For example a new player would never learn how to make a copper golems and how they work, Or like putting lava under a sulfur block with water above (which is insanely specific) creates steam. So for the reason ls above i think some kind of codex/mechanic book would be a nice feature, it could be either craftable or implemented in the ui/pause menu or other ways