There are many resources available for these compilers - here on the Red Hat Developer Program site and on the Red Hat Customer Portal.
This is the the official documentation for compilers in Red Hat Enterprise Linux 7. On this page you will find links to the documentation for versions of the Rust Toolset, Go Toolset, and the Clang and LLVM Toolset.
Documentation for using compilers in Red Hat Enterprise Linux 8 can be found within the documentation for the specific version of RHEL. For example, “CHAPTER 16. COMPILERS AND DEVELOPMENT TOOLS” contains information about and links to the specific compilers that exist in RHEL 8.