Linkhandler is the synonym for making it possible for editors to create links to custom records.
Until 8 LTS a 3rd party extension has been required but since then it is integrated into the core. Read at https://docs.typo3.org/typo3cms/extensions/core/8.7/Changelog/8.6/Feature-79626-IntegrateRecordLinkHandler.html about the feature.
This tutorial is also valid for creating links to any other record.
Configuration for the backend
PageTsConfig is used to configure the link browser in the backend.
# tx_news is an identifier, don't chage it after links have been created
handler = TYPO3\CMS\Recordlist\LinkHandler\RecordLinkHandler
# A translatable label can be used with LLL:EXT:theme/locallang.xml:label
label = News
table = tx_news_domain_model_news
# Default storage pid
storagePid = 123
# Hide the page tree by setting it to 1
hidePageTree = 0
scanAfter = page
Configuration for the frontend
The links are now stored in the database with the syntax <a href="t3://record?identifier=tx_news&uid=456">A link</a>.
By using TypoScript, the link is transformed into an actual link.
# Detail page
parameter = 123
additionalParams.data = field:uid
# If there is a plugin with mode "Detail", the controller and action parameter might be skipped
additionalParams.wrap = &tx_news_pi1[controller]=News&tx_news_pi1[action]=detail&tx_news_pi1[news]=|
useCacheHash = 1