Before you post a reply on a topic, you should follow the discussion, not only read the OP's post but also until last post reply. Most of the time, someone already wrote what you're going to write so don't repeat it. Remember "read more and write less."
I am totally agree with you about this, cause if you read more gradually you will improve your knowledge, if you have good knowledge then your posting and reply quality will increase and other members in this forum will find something new from you. But learning is not a one time task, its a life long process, you have to continue this to stay updated and become more knowledgeable.