In TYPO3, you can create your own custom content elements using masks. These masks let you design content exactly how you want it, whether it's adding images, videos, or organizing information. With masks, you have the freedom to customize your website easily and make it work just the way you need it to.
Getting Started with Mask
New Content Element Wizard
How to Create Fields In Mask?
Table Configuration Array (TCA)
Element Meta Data Tab Using Mask
Read More: https://nitsantech.com/blog/mask-create-custom-content-elements-in-typo3