Few more concepts to clarify

[bast]

Suggested by @dhanyapushpadas based on feedback/questions from last workshop:

• fork vs clone -> Why fork instead of cloning?
• Difference between pull and pull request
• Difference between pull request and issues
• difference between branch + pull and fork + pull?

[bast]

The last one I don't understand so I did not address it in #316.

[dhanyapushpadas]

I have addressed the last one. Pls see