For a supplementary angle I’d highly recommend having a nose in both the Postgres docs and source. They’re both very readable. I think the section on internals

For a supplementary angle I’d highly recommend having a nose in both the Postgres docs and source. They’re both very readable. I think the section on internals is a good jumping off point that leads to a lot of deeper content. https://www.postgresql.org/docs/current/internals.html https://www.postgresql.org/docs/current/internals.html