I go through the most common problems when trying to use the nextion display with arduino, and the solutions.
Buy the Nextion 3.5″ Enhanced: https://amzn.to/2OgFYPL
Buy the Arduino nano: https://amzn.to/2Q4sA5h
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Nextion library: https://github.com/itead/ITEADLIB_Arduino_Nextion
Nextion project to change default baud rate: https://drive.google.com/open?id=1sqWnA_mu1FOsMp3ZvWI6G3rQoG1xliTR
Nextion+Arduino Tutorial #1 Beginner’s Guide: https://www.youtube.com/watch?v=wIWxSLVAAQE
Nextion+Arduino Tutorial #2 Sending Data To Arduino: https://www.youtube.com/watch?v=mdkUBB60HoI
Nextion+Arduino Tutorial #3 RTC and EEPROM (Enhanced Version): https://www.youtube.com/watch?v=7Dkn3t_jjN8
Nextion+Arduino Tutorial #4 Custom Gauge And Play Video: https://www.youtube.com/watch?v=eDn7LFyoEm8
Nextion+Arduino Tutorial #6 A Project From Scratch: https://www.youtube.com/watch?v=OhYyBpjyR14