SunFounder ESP32 Starter Kit
3. Add the following URL to the Additional Board Manager URLs field: https://espressif.github.io/
arduino-esp32/package_esp32_index.json. This URL points to the package index file for the ESP32 boards.
Click the OK button to save the changes.
4. In the Boards Manager window, type ESP32 in the search bar. Click the Install button to start the installation
1.3. 1.3 Install the ESP32 Board(Important) 11