Moving an app to Trash removes its application bundle, but it may leave preferences, caches, documents, or support data behind. Those files can be useful if you reinstall the app, so leftovers are not automatically junk.
Start with the app itself
Use the developer’s documented uninstaller when one exists. Then check whether the app offers a removal option or stores user-created content that should be exported first.
Be careful with related data
Do not delete all similarly named folders without checking their contents and ownership. Shared frameworks and group containers may be used by more than one app.
A careful next step
Use this guide to understand the storage you see, then make changes only after reviewing their purpose. DiskClue can help make the evidence easier to inspect in the current MVP.
Understand your storage with DiskClue →