Are there any differences on different Microsoft partner portals?

Hello There!
I am from North and Central American Region by the way and as I was trying to access and or visit the Microsoft partner portal / network that is designed for my country, I just wondered if there are any differences from the different country that the selection of location has to offer?
Aside from that, as I have selected my country and trying to gain access on the network itself there is an enrollment to proceed. Is this for free?
And is it necessary that you have all of the 3 requirements that is listed on the enrollment page? I hope to be hearing an expert advice about this soon so that I can likewise know what better things to consider and do before doing anything.
Thank you.
