As simple as 4 rules of code you can do create a mySQL statment for database interactions.

By default users cannot register unless you enable them to. This is a Joomla setting.

Below you can find a simple update statement for PHP in Joomla!

To make the default Joomla forms more secure, and safe from spammers, you can add a captcha to your Joomla site. This tutorial shows you how to do just that.

When writing a Joomla module or component, you can access the database with the JDatabase option.

Below you can find a script that loads the joomla 4 (only 4) framework on an external PHP page

You can have all your module positions shown on your website. 

Should you have a module installed that locks you out of your back office (for instance the IP block module), you can disable this in the Joomla database.

For the Instagram feed JS module to work properly, you need an Instagram ID for the account you want to show. Not only do you need the ID but also an Instagram Token.

Follow this steps to acquire a Google Maps Api Key and then add it to your Joonext Settings.