The easiest way is to go here:
https://kindle.amazon.com/your_reading
Sign in and you can copy and review all hour highlights and notes there. You can copy and paste to any other documents.
You can also copy the Clippings file to your PC via a USB connection but that is far more trouble.
As one reads and finishes more books, try their Daily Review. It's use is described by Amazon as follows:
"Daily Review is a tool to help you review and remember the most significant ideas from your books. It shows you flashcards with either your highlights and notes or the Popular Highlights from one of your books.
Only books that you have marked as "read" are eligible for review, and Daily Review will take you through all of your read books, one per day.
The periodic review of ideas makes it easier to remember them. This works better if you space the reviews over increasing time intervals, a "Spacing Effect" that was first identified by German psychologist Hermann Ebbinghaus. Depending on how many books you have marked as "read", you will see a particular book again in the Daily Review in roughly 1 week, 1 month, 3 months, 6 months, and thereafter annually. You’re not limited to reviewing only one book per day; at the bottom of the flashcard you can select "Review another book".
That concept alone makes the Kindle WiFi a daring break through on how we read and remember what we read.