Where can I learn about energy sector?

If nobody else answers, my tried and true technique is to refine exactly what I want to study, then try to map that into a college-level course, steal a syllabus, find a textbook, begin self-education.

Oh! Also there’s this guy Vaclav Smil you might check out. He is an author of absolute compendiums on all things energy. “Energy & Civilization” comes to mind.

I'm not sure if you were interested in the technical aspects or the geopolitical and economic parts.

If the former, try a college energy engineering or environmental engineering textbook. Or for hands on stuff, check out this wiki: appropedia.org

I work in the solar industry (as a dev) and have previously taken some of the coursework meant to prepare installers (NABCEP). An entry level PV certification takes about a full time week to learn, for example. Pretty thorough stuff covering the industry basics.

For analysis, the National Renewable Energy Lab (NREL) publishes a lot of free research.

Note that everything I said is biases towards the renewables side. I am not familiar with how oil and gas works.

This video might be useful as a broad overview of oil and gas[0]

This podcast on nuclear energy was pretty informative but ultimately still left me with many questions.[1]

[0] https://www.youtube.com/watch?v=qWyhKobyM68

[1] https://podcasts.apple.com/us/podcast/the-future-of-nuclear-...

Can you expand on which parts of the energy sector you want further knowledge of? The question you posed is too broad for anyone to be able to meaningfully reply.

I just started "The Science of Engergy" by Michael Wysession for the same reason.