What is the chip module system?

What is the module system? 

Environment Modules provide a convenient way to dynamically change the users’ environment through modulefiles. This includes easily adding or removing directories to the PATH environment variable. Modulefiles for Library packages provide environment variables that specify where the library and header files can be found. - Lmod: A New Environment Module System — Lmod 9.3 documentation

How do I interact with the module system?

User Guide for Lmod — Lmod 9.3 documentation

Note that the docs provide information on how to load modules, but loading modules does not work on the login node. This is to prevent users from attempting to develop on the login node.