As you build your website over time, it’ll likely be important to set up redirects to handle pages that you remove, or when adding SSL, or other things of that nature. Google wants to remind you that when you set up a redirect, they will no longer index that old page.
You can read more about this on this article at Search Engine Roundtable.
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This is one of those things that makes sense, and that you probably already knew, but it’s good to be reminded. If you redirect one page on your site to another, Google won’t index the content on the first page and only care about what shows up on the final page they land on.
This is also why it’s not beneficial to buy a bunch of domain names with keywords in them; they’ll all (ideally) be pointing to a single URL, and that single URL is all that Google cares about.
So if Google doesn’t look at content on pages that have been redirected, then why mess with redirects at all? Two reasons:
1 – For your visitors. If a page goes away, people might have it bookmarked, or shared on social media, or somehow still have that old link, and you don’t want them to land on a 404. Have it redirect to the best solution that matches your old page.
2 – For Google. While Google doesn’t look at the content, they still pass link juice from that redirected page. If other sites link to it, this will help you make sure that Google passes along the credit for those links to the new page.
Your best bet is almost always not to move pages and set up redirects at all, as it can get kind of messy, but if you do just be sure to understand the consequences of that redirect.