Hello,
I'm new to Wolfram Language. Yesterday I spend 2 hours Googling about ecosystem of WL.

I would ask how do I get Wolfram Language. I would like to install WL package to my Debian Jessie (testing) just like I can do for Raspberry Pi. Also, I tried Wolfram programming cloud. Is it complete implementation of Wolfram Language? I found out that lots of thinks doesn't work there (Camera...). Also, when I try to do something like CountryData["G20", "Flag"], it takes so long and if I request more, it fails. And does developing in notebooks take credits (or is it limited another way)?