Themes or language files: If the software supports multilingual or theming, locate the lang folder for translations and views or themes for templates. You can modify text in translation files or customize HTML/CSS templates. Hook/Event system: Most modern platforms offer hook or event mechanisms. Check the documentation for available hooks and write custom modules or filters that register to those hooks. Custom code: If there’s a custom or extensions directory, you can place your own PHP or JS files there so they load automatically. Avoid modifying core files directly to prevent conflicts during updates. API integrations: If the software has a REST API or GraphQL, you can build external applications that communicate with your installed software to extend its functionality.