Free Courses Not Free – Help

Coursera is a global online learning platform that offers anyone, anywhere, access to online courses and degrees from leading universities and companies Hello, I just registered in order to take a couple of free courses but I was surprised when they said I only have one week for a free trial and the course is for at least a month. I’m trying to get back to studying even and everything that I find advertised as free ends up with having to pay. I don’t have a credit card and I need any type of free course so I can improve myself intellectually and mentally. I hope someone can help.