Use them whenever things are one project, only split them up when it's legitimately separate projects.
At work I set up a repo with our back-end code in one directory, the front-end in a directory, and the ansible playbooks/other deploy stuff in another..
This allows us to automatically create servers for every branch because we know that everything goes together. Working on other projects where they have all of these separate is a nightmare. Especially when they use microservices and each service has its own repo and each library has a repo... I want to smack anyone who ever thinks that is a good idea
At work I set up a repo with our back-end code in one directory, the front-end in a directory, and the ansible playbooks/other deploy stuff in another..
This allows us to automatically create servers for every branch because we know that everything goes together. Working on other projects where they have all of these separate is a nightmare. Especially when they use microservices and each service has its own repo and each library has a repo... I want to smack anyone who ever thinks that is a good idea