Beginners Questions:

Need Answers to know where to start please. I have ubuntu 12.4 am new... also was told to run dual system with win7 ultimate 35 languages. Sons programmers have things set to use bootstrap.
1. can I tell by viewing source page info if a website uses ubuntu, bootstrap, or win7?

How can I attain that type information from websites?

Some of that info is in HTTP headers. A forum about HTTP and general web information will be a better place to ask. This forum is centered on the Omeka CMS.