Learning about others is an intermediate skill as the child has to use basic skills to start an interaction with another child. To do so, the child has to think about what he/she wants to know about the other child, ask the question, listen to the answer, wait until the other person has finished talking and ask more questions if wanted.
You see a friend has a new book, you need to decide the right time to approach him and what to ask.
Find the right time to approach the other person, think about what to ask and remember to do it in a nice way. Listen for a response and reply back with something in necessary.