To build a website on TYPO3, follow the steps given below:
Install TYPO3 using Composer:
Go to Web > Page in the backend
Create a root page and other necessary pages for your website
Install an existing theme or create a custom one using the Extension Manager
Use ‘Fluid’ templates and ‘TypoScript’ for customization
Use Web > Page to add text, images, and other content elements to your pages
Go to Site Management > Sites to configure domain, language, and other settings.