Ask HN: Any recommendations for online marketing courses?

My Context: a solopreneur / bootstrapper building his own business. Currently following: https://growthlab.com/products/zerotolaunch So far, I found it a bit too beginner-level / inspirational kind-of-content And I have heard good things about these ones: - Marketing for developers: https://devmarketing.xyz - 30x500: https://courses.30x500.com - Double your freelancing: https://doubleyourfreelancing.com