Where the os is free

Where? A computer operating system is free! when the last windows operating system named Windows7 costs about more than 80$. And Mac os x costs 29$.

I don’t think that you say this as you are reading a blog at Blogger. I say you know much about Internet & particularly about computer. So I don’t think that you don’t hear the word “Linux”.  Many of us know that linux operating systems are free, But few know detail about that or wishing to get linux os but don’t know how to get or in a fear of understanding to operate. This is for those people. I’m trying to them to know about linux. Let’s see…