From the Tutorials Point collection:

https://www.tutorialspoint.com/erlang

Erlang can be installed via package manager (like apt).

To load programs you need to enter the Erlangs REPL with erl, and load modules with the c(module_name). command.

Words that start with lowercase are recognized as atoms, and variables star with an Uppercase letter. I think these are the same converntions from Prolog. Erlang seems to be heavily inspired in Prolog ideas.