Note: I'm an analytics "n00b".
I have a specific page on my website, say [/users/register].
Where in Google Analytics do I go to see where visitors to that page went to next?
I saw that, for that page, the was a column called "Landing", but the number there was lower than the number of visitors?
When I looked at that page under the Landing Page report, I saw that it looked to have the info I needed as it had an Exit value... however, I don't know what that means, and I don't understand why the Landing number is so much lower.
Regardless I just want to see where visitors to that page went to next?
Go to the Landing Page report, now in this report at the top you should see two tabs
You probably want to see the Entrance Paths.
Under the "Content" menu on the left there is "In-Page Analytics".
This will show you where people clicked next for any given page.
Actually, what you want is hidden in Visitor Flow:
Go there, and find the page you want stats on where visitors went next. To do that, you need to click on that page and select "Explore traffic through here", which ultimately leads to another flow visualisation, but only includes traffic going to and from that page:
I thought I would update this to include a 2018 answer and perhaps a bit more depth.
If you are like me and wanting to find where people are going from a specific page rather than the landing page, it's actually pretty easy!
Go to Behavior > Behavior Flow
The default view here will show traffic from the landing page. To get a specific page, click the little settings cog beside the landing page as shown below
You'll be able to "add an item". For my example, I wanted to see where people were going from the /category/ pages. So I used the "contains" /category/ to get all pages that have /category/ in the url.