https://www.youtube.com/watch?v=qEVaXmA2-zY
Calculating ARIMA forecasts manually
ARIMA input to output
https://www.youtube.com/watch?v=2Z5KnMPIIIc
ARIMA Model Diagnostic
ACF PACF plot determine order
https://www.youtube.com/watch?v=zNLG8tsA_Go&t=3s
What are Moving Average Model