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I found a port left to the headphone output (the one plugged in with a cord with a green jack), right to the USB ports, and under the SD card slot. It has the same radius as the headphone output. What is it?

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That's the audio in port.

Audio in/optical audio in port

The Audio In port accommodates both digital optical input and analog audio input.

Analog audio line input is accepted through a 3.5mm mini phone jack. The sound input port accepts line-level stereo signals up to 24-bit stereo 44.1-192kHz sampling rate. It also accepts a stereo miniplug-to-RCA cable adapter for connecting stereo equipment to the computer.

Optical audio input is SPDIF format and uses a standard TOSLINK cable with a TOSLINK mini-plug adapter, accepting up to 24-bit stereo and 44.1-96kHz sampling rate.

Source: https://support.apple.com/kb/HT202638

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