HOW TO DIFFERENCE MY POST WHICH I SHARE FROM OTHERS OR I ORIGINALLY WRITE MY OWN?

I can said that some of my post, are shared from others. Although like that, there are quite a lot of post are written by myself. First, if I shared others's post, I will mentioned early or you see that there are two same titles in one post. Otherwise, you will see only one post one title if the posts are written by me... I just want to mention it clearly right now so you all were not confused... Thanks You...