(Note) How to Solve Q2's "error: Can't place multiple pins assigned to pin location pin_ae24 (ioc_x65_y2_n2)

The following error message is displayed during compilation of the Quartus II project. For details, see:

The pin_ae24 pin is used in the project, but this pin has dual-function pins. Therefore, you must configure the pin before use, that is, whether it is a common pin or a second function pin.

The specific configuration is as follows::
Click the icon or select from the menu bar.

Or

Select device and pin options

On the settings page, select the dual-purpose pins tab to configure the special dual-function pins.

After compile is implemented, no errors mentioned above will occur. Other dual-function pins are similar to the configuration.