How do i enable an apache module?

hawksbill

Man page for a2enmod: https://www.lightnetics.com/post/8659

It varies on centos/redhat type systems and debian based systems.

Redhat/Centos.
You edit the config files normally under /etc/httpd/conf/httpd.conf, the main config file you can see includes a modules directory, which pulls in specific modules, the separate directory was created to keep the main config file streamlined. To install it normally a case of uncommenting the entry or installing the module first and then adding the entry, usually installing the module creates the relevant module files too.

# Example:
# LoadModule foo_module modules/mod_foo.so
#
Include conf.modules.d/*.conf

Debian based Linux.
You can use the perl scripts.

$ sudo a2enmod proxy