Trending @Accenture; Condition contract process in SAP SD

Do anyone have any idea or suggestions on how to learn the condition contract processing topic in s/4hana as a beginner ? My lead is keeping on assigning tasks related to it so that i learn but the only person who knows this topic is one of my senior and he does want to teach me. The youtube videos are not having much basic info on this topic. The videos are for people who already know the rebate process in ECC but i dont have knowledge on that area as well.