What do you enter in a robots.txt file to block a specific directory and everything in it?

Which statement is true regarding natural vs. artificial inbound links?

From a purely ranking perspective, the value of an incoming link is not affected by the number of outgoing links on the same Web page.

What do you enter in a robots.txt file to prevent the crawling of an entire site?

What would happen if you searched Google for site:example.com “some text here”

In the robots.txt file, what does the 'User-Agent:' section do?

What is the difference between exit rate and bounce rate? 

Which will not prevent content from appearing in search results?

What do you call the filename that tells search engines whether they can access and therefore crawl parts of your site?

If over the time your website URL structure changes, which method will you use to not lose your website visitors?

What is the best practice to use when you are using images as links?