Good question! There isn't a standard location for an RSS feed for a website, but with these three tips, you should be able to find it.
1. If you are feeling lucky
Add "/rss" and "/feed" to the end of the website's address, this may be the URL of the feed. Some examples being:
http://blog.storychief.io/rss (using William) and https://techcrunch.com/feed (using WordPress).
2. Check the website
Visit the website and see if you can find a link or icon to their feed. The standard icon for RSS looks something like this:
3. Use a search engine
As a last resort, enter the website's name and "RSS feed" into your search engine of choice. If they have one, you are sure to find it that way.