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The tips written there should (hopefully) be fairly obvious to seasoned programmers, I agree.

However, I find that this is particularly helpful in that it based on an actual working code base, instead of contrived examples. It demonstrates that writing clean code isn't just a pointless academic exercise, there is a purpose to it.

The lowest quality of code I have ever seen has been tutorial code. In my experience(of reading various tutorials) it is uniformly badly written. There is never any error detection, basic things like setting up constants are relatively rare, Logging and debugability is never considered.

Yes, most of them are normal coding practices. But ways to write better code generally are or at least should be normal coding practices. But many people do not know what the normal practices should be.