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Does anyone have any information on how to extract specific content from different pages in one single space in confluence.
I don't think I understand what you are looking for here. An easy answer to "extract specific content and put it in one place" is simply "copy and paste what you want"
But I suspect the requirement is more complex than that.
I am going to take a guess, so please don't hold me to this solution if it is not what you need:
Find the pages you want to extract content from, find the content and wrap it in an "excerpt" macro. Then create a new page somewhere and put lots of "excerpt-include" macros in it - one for each block of content on the source pages probably.
I agree with what Nic has suggested, i.e Use "Excerpt" macro on pages from where you want to fetch the content and create a central page where you can add "Excerpt Include Macro" to display the content from the pages you created earlier.