[O] Numbering only second-level headlines in export

[Jarmo Hurri]

Greetings.

What - if any - would be the recommended way to implement numbering only
second-level headlines in an exported document with running numbering
(resets with first-level headline change)?

BTW, here is a full programming course (used to teach kids of different
ages) written almost entirely with org:

https://www.syk.fi/ohjelmointi/

The generation of the front page utilizes a couple of shell scripts,
some javascript and R, but it's all org otherwises. The entire source
code can be found here:

https://github.com/jarmohurri/ohjelmointi

All the best,

Jarmo