For example: Python： https://docs.python.org/3/reference/index.html I can read about Python’s syntax and “core semantics” in the document. But Where is Ruby Official Language Reference/Manual? ------ 1) https://ruby-doc.org/ When I try to go to: https://ruby-doc.org/ I found: https://ruby-doc.org/3.2.2 This just explains the Class & API and the SEARCH function is hard to use. e.g It cannot search __FILE__ thought it on "Keywords" chapter. 2) https://rubyreferences.github.io/rubyref/ I can read some "syntax" on this document. But it is not Ruby Official Books and it is not up to date. 3）https://ruby-doc.org/docs/ruby-doc-bundle/Manual/man-1.4/ I found it with the help of Google. I cannot find this document link on https://ruby-doc.org/ This document is great and written by the author of Ruby. It looks like the Ruby Official Manual. But it looks too old which was last modified in 1998. ----- So, Where is Ruby's Official Language Reference/Manual? 😂