Arduino Reference: The official site lists standard libraries.
Locate your Arduino sketchbook folder (usually found in Documents/Arduino). Open the libraries subfolder. download biblioteca arduino
GitHub: The go-to home for open-source community contributions. or if the automatic importer fails
Download the library folder from the source (usually a "Download ZIP" button on GitHub). download biblioteca arduino
If you prefer to organize your files manually, or if the automatic importer fails, you can move the files yourself.
Arduino will automatically extract the files into your libraries folder. Manual Installation