Now that you mention it (and I hope everybody sees this, but they probably won't since I'm late to this discussion), Field has what I think is the best advice I've seen on how to season cast iron cookware:

https://fieldcompany.com/pages/how-to-season-cast-iron-pan-s...

Oven seasoning instructions:

https://fieldcompany.com/pages/how-to-season-cast-iron-pan-s...

How to care for cast iron cookware:

https://fieldcompany.com/pages/how-to-clean-maintain-cast-ir...