Many TYPO3 extensions use Github as version control system. With Github Actions and TYPO3 Tailor it is possible to automatically deploy your extension to the TYPO3 extension repository every time you create a new release.
For the weblog I wanted to add a "Popular posts" block to show the most visited posts of the last 30 days. I didn't find an existing extension to achieve this, so I made my own: matomoapi. It uses the Open Source statistics platform Matomo, which has an API to get the data I wanted.
In TYPO3 you can link to pages, files, folders, external URLs, e-mail addresses and telephone numbers by default. But what if you want to link to a different record, like news. You could use an external URL link, but with a few lines of page TS config and TypoScript you can add a tab to the link window to link directly to a record.