See also the following links:

▎ENGLISH

Regression Forecasts with Seasonality
▸ https://www.real-statistics.com/multiple-regression/multiple-regression-analysis/seasonal-regression-forecasts/

ARIMA Model – Complete Guide to Time Series Forecasting in Python
▸ https://www.machinelearningplus.com/time-series/arima-model-time-series-forecasting-python/

A Gentle Introduction to SARIMA for Time Series Forecasting in Python
▸ https://machinelearningmastery.com/sarima-for-time-series-forecasting-in-python/

▎日 本 語

自己回帰和分移動平均モデル (Wikipedia)
▸ https://ja.wikipedia.org/wiki/自己回帰和分移動平均モデル

ARIMAモデル（自己回帰和分移動平均モデル）について分かりやすく解説！
▸ https://ai-trend.jp/basic-study/time-series-analysis/arima_model/