Yes, of course, knowledge sharing is useful. Most often, it happens when someone gets a “research” task which requires delving into something complex. Later on, this person will usually write something about his research and everyone will be able to learn this “complex” topic and ask questions if they appear.Sometimes we cover basic topics as well. For example, Kirill Elagin wrote some pages about copyright and licenses for internal use. I knew almost nothing about it, so these pages were very helpful for me to learn these basics. Also, we have good internal sources to learn from: practical materials and academic papers.