https://www.nuclino.com/articles/process-documentation explains it better than me. Yo need to get a high view understanding of what the people do in every process. That way you will know better, it will be documented, it can be optimized, and you will know what people is talking about even if you don't know the small details. Also if they are trying to bullshit you. You need knowledge. Also you will find ways to help.