I am having trouble uploading to my Arduino Nano. My MacBook cannot find the port. Please help I"m trying to finish a project.
assuming that your board is a clone (not manufactured by Arduino), you will need to install a driver for the ch340 chip, this chip converts the usb to serial that the Atmega (328p or 168) will understand. There are also two types of arduino nano the Atmega168 type and the Atmega328p type, you have to know which one you have to program it.
this is the link for the ch340 driver:
https://sparks.gogo.co.nz/ch340.html