You removed some misconceptions. If you share something that is copyrighted, you cannot share that without permission. But you want to share some information from a blog or website, feel free to share that. That blogger will be very happy that you shared his/her article. In a way, it benefits him/her as well like getting traffic, better ranking on Google, building the brand and so on.

At the same time, when you share that with others, people learn something from that or they get the benefit. It is a win-win situation.