Learning How brave works

Hi i want to learn how brave works internally ? any resources ? :thinking:
i want to know how it renders this image :
Paint-By-Numbers-Customized-Kits-320x400
i got is from this custom paint by numbers store.

What do you mean? For example, are you highly familiar with coding and you want to know where the Github for code and all is? Or what level of knowledge/expertise do you have and exactly what kind of information are you seeking?