Any code a computer accepts will run, but code other developers can actually read is a different, harder skill — and it's the one this course is built around.
Clean code, as covered here, is a reader-focused way of writing software: prioritizing clarity so that what you write today is still easy to read, understand and maintain months or years later, by you or by someone else entirely.
Across 91 lessons, the focus stays on that single idea — writing for humans first — rather than covering a wide grab-bag of unrelated topics.