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First question: What is the difference between the <div> tag with all the other coding block head tags?
  like <head> tag and <body> tag.

Second question: Does space make a difference between each tags?
  i use to code with python and the space in every single block of code is very important.

Third question: Does it make a difference is i left the quotation marks out when coding with HTML and CSS or
  is there any certain area that i have to watch out for?

Fourth question: I'm still don't understand how does the <link>tags works, could you explain it to me in detail?

Fifth question: How does the <meta> tag work in HTML?
  it looks like the <meta> tag does not have a closing tag. looks like is very diffent with all the others .