Hi there! And sure, go ahead.
I'll try to answer that as well as I possibly can!
Polygamy as in marrying more than one person? Yes, that's true! A man can marry more than one woman in Islam but it is only done if you /really have to do it/. A lot of people abuse this law unfortunately though
It is only advised to marry another women if for example her husband died and she's a widow with no source of income. Then in that case, you can marry her if you want and if she agrees to it. Otherwise, there's really no need. But like I said, a lot of people abuse this law and do it regardless of whether or not there's a need to.