Unixcop published a tutorial about installing Ruby on CentOS 9 Stream.

How to install Ruby on CentOS 9 Stream

In this post, you will learn how to install Ruby on CentOS 9 Stream. This programming language is one of the classics, but still important for many applications and scripts. According to Wikipedia: Ruby is an interpreted, high-level, general-purpose programming language which supports multiple programming paradigms. 

How to install Ruby on CentOS 9 Stream - Unix / Linux the admins Tutorials