Here's a simplified version of the approach (i.e. performing strong feature engineering, then converting the multivariate time series data to a panel/tabular dataset and training a boosting trees model on it), using temporian (a much improved alternative to pandas for working with temporal data) and xgboost: https://temporian.readthedocs.io/en/stable/tutorials/m5_comp...
I used to be an xgboost bro but these days I'm schilling for catboost. Anyways both have lots of examples online. The truth is without a problem interesting to you there's not much reason to learn about them unless you simply find gradient boosting algorithm elegant. Otherwise I would take some intro to machine learning course.