What do you understand from this? What do you get from this? I just wanted to add that there's a difference between these expressions depending upon the context. For me, "What do you understand from this?" asks for an intellectual or factual response. In the question "What do you get from this?", the "get" can mean either "understand" or "receive" and could additionally ask for an emotional response. For example: Q: "What do you get [understand] from this?" A: "I get [understand] that the author of this book was sad." Or: Q: "What do you get [receive] from this?" A: "I get [receive] a sense of sadness when I read this book."

What did you understand from this? - this is better We are on the phone several times a day. - this is OK We talk on the phone several times a day. - this is OK