t27 basics 27: three courses, in order

The three t27 courses in order, what each one covers and where it starts. Lesson 27 of the t27 basics course.

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Where the numbers come from

The lesson spec public/t27/files/specs/basics/27_where_next.t27, compiled clean on 7 backends by public/t27/t27_compiler.wasm, whose tests pass in the site test runner
Compiler verdicts, error lines, code and counts quoted on this page are what the same wasm answered in node 22 when the course was authored; words without a run behind them are said to be read, not run