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The material on this site, put in the order that teaches it rather than the order I wrote it in. Free, no sign-in needed to read.
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0 to Hero SQL
A roadmap through SQL, from a first SELECT to isolation levels and query plans — written against PostgreSQL and MySQL side by side, because the two disagree exactly where it costs you.
Modern Java in Production
A path through the Java material on this site, in the order it makes sense: what the language gives you now, the patterns that survive a code review, and what breaks at 3am.