Support for importer-changes

Dear all,
I am part of this community for now 3,5 years and mainly asking for help in the Degiro importer topics.
But as these importer changes depend quite a lot on the resources which are available to do coding, I am wondering if we “normal” people can help somehow besides just providing the debug extracts.
What does one need to know to make some changes to the importer code?
Do you have some tutorial video links which could help?