Greetings all... I'm new to this and want to learn. I have a "Raspberry Pi 3 Model B w/ 1GB with No OS". Can I use Ubuntu, CentOS or another version of Linux? or am I stuck w/ NOOBS process found on their site? I also found a link on the siite for a potential load of Ubuntu but I can't tell if this is a free do-it-yourself process or if it is a process I have to pay for. I want to go thru the process myself as long as I have the proven workflow steps for success. I plan to use a 64GB microSD card in the microSD slot on the backside of this unit. Thoughts? Suggestions? Please advise.