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Hello,
Arduino noob here. I have an arduino one that is blinking since i plugged it in. Ive tried to run blink code and fade code but I keep getting errors.

Arduino: 1.8.0 (Mac OS X), Board: "Arduino/Genuino Uno"

Sketch uses 1150 bytes (3%) of program storage space. Maximum is 32256 bytes.
Global variables use 13 bytes (0%) of dynamic memory, leaving 2035 bytes for local variables. Maximum is 2048 bytes.
/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avrdude -C/Applications/Arduino.app/Contents/Java/hardware/tools/avr/etc/avrdude.conf -v -patmega328p -carduino -P/dev/cu.usbmodem5D11 -b115200 -D -Uflash:w:/var/folders/t1/yhpwb_9d71d9d3nq59blcq5r0000gn/T/arduino_build_36317/Fade.ino.hex:i 

avrdude: Version 6.3, compiled on Dec 16 2016 at 13:32:25
         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
         Copyright (c) 2007-2014 Joerg Wunsch

         System wide configuration file is "/Applications/Arduino.app/Contents/Java/hardware/tools/avr/etc/avrdude.conf"
         User configuration file is "/Users/local-admin/.avrduderc"
         User configuration file does not exist or is not a regular file, skipping

         Using Port                    : /dev/cu.usbmodem5D11
         Using Programmer              : arduino
         Overriding Baud Rate          : 115200
avrdude: ser_open(): can't open device "/dev/cu.usbmodem5D11": No such file or directory

avrdude done.  Thank you.

Problem uploading to board.  See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

SOS.

Either you need a driver for your board (potentially a clone with CH340) or you selected the wrong communication port on your Mac. Normally the com port on Macs are called "dev/cu.usbserial-..." where the Arduino is connected to.
If you don't see this comPort, your Mac cannot detect your Arduino being plugged in as the driver is missing or your USB cable is not ok.