Codeigniter info
Creating a Custom Controller and View in CodeIgniter
https://selftaughtcoders.com/controller-view-codeigniter/
Configuring a Database in CodeIgniter
We’ll be utilizing our database very frequently, so we’re going to “auto-load” CI’s database library, which will make it automatically available throughout the app.
https://selftaughtcoders.com/configuring-database-codeigniter/
Learn How To Integrate Bootstrap 4 in Codeigniter
https://blog.eduonix.com/web-programming-tutorials/learn-integrate-bootstrap-4-codeigniter/
Autoload multiple databases:
https://forum.codeigniter.com/thread-772.html
Removing the index.php file, add .htaccess to root