One gradually learns which relationships are held by enduring fondness and which will crumple amid structural collapse.
Back in my days working in the Bell Labs Software Production Research organization (Production, indeed!) we had some back-of-the-envelope findings that suggested that consistent indentation style was one of the most statistically significant indicators of low bug density.
So, perhaps, instead of asking that dreaded question, ‘What next?’ turn it into this question: 'What do you want to learn?’
I don’t know the answer.