TYPO3 v10 has reached end-of-life as of April 30th 2023 and is no longer being maintained. Use the version switcher on the top left of this page to select documentation for a supported version of TYPO3.
Need more time before upgrading? You can purchase Extended Long Term Support (ELTS) for TYPO3 v10 here: TYPO3 ELTS.
There are different technology choices to create frontend plugins in TYPO3.
For scenarios with user input and or complicated data operations consider using Extbase.
Legacy frontend plugins without Extbase, so called "pi-based plugins" are based on the AbstractPlugin. It is not recommended anymore to use the AbstractPlugin as base for new frontend plugins. The Core does not use it anymore and only few third party extensions still use it.