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Two principles I've been teaching my 11 yo about programming: 1. Whenever you change a program, test it. 2. Adjust the size of your changes based on your confidence. Start with small changes. When those work, you can make bigger ones.
These two rules imply that you should begin any new program by solving the smallest subset of the problem you can test. (Famous example: The first version of GMail, which Paul Buchheit wrote in one day, was read-only and only worked for his email.)
i guess your 11 yo is using lisp...
Which programming language 11 yo is learning?
agreed, and it feels applicable to more than just programming :)
My 9 yo makes me apply 1 regularly. He's not so great at 2 though. :)
0.1 To backup before changing anything and learn the version control. 
I'm curious. Are you teaching him (her?) coding because they're into it, or because you think it's a basic skill irrespective of interest? (like writing could be) I've wrestled with this dilemma for quite some time
code a little , test a little , repeat
Applies to life too.
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