Hi Riccardo.
I use the official documentation
https://www.pymc.io/
and I also watch several YT videos (for instance: https://www.youtube.com/watch?v=UznM_-_760Y) or web articles (for instance: https://towardsdatascience.com/bayesian-marketing-mix-modeling-in-python-via-pymc3-7b2071f6001a)
I also looked at and tested PyMC marketing. It’s very useful, but I prefer to maintain maximum flexibility by customizing my models. I hope I have been helpful.
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