The part of the essay I liked the most was perhaps his comment about having strong convictions on things. This is incredibly important. To get to a level of knowledge on anything to get that conviction though, requires a lot of deliberate reading and experience. For instance, I didn't care much about politics until the 2016 election; the entirety of 2017 I spent learning more about the political structure of the US, the history of every party, the history of laws and such... a lot of things that has given me a strong base from which to view current events and future policies in a more nuanced way, rather than being influenced by the latest Op-Ed in NYT. It took a lot of effort, but for me its worth it if only for the perspective that you get from history.
The lists part is also highly recommended: it helps me offload things that I want/like to do in a concrete medium and not have to try and recall things when I get some time.