I have been developing websites for years. This is a common misconception, or incorrect assumption. In reality your biggest ranking from Google comes from your content. When people update their site links are sometimes changed or removed. This makes Google think your website is old or has errors and drops your rankings.
There are a few easy ways to resolve this.
1. Use Google Webmaster Tools to submit a XML sitemap - If you use wordpress there are many nice plugins that will make the sitemap for you and you just need to submit it - www.google.com/webmasters/tools/
2. You can use this link to assist you with making 301 permanent redirect (assuming your using a Linux web server) for url's that change. http://www.webconfs.com/how-to-redirect-a-webpage.php
Doing these things allows Google to ensure your site ranking is still correct and has the same content (plus more)!
Let me know if you have any questions
I really want to do some changes to my website, but am getting lots of new customers and rank on the first page of Google and Yahoo for my product.
I've heard that if you change your website, you can loose your ranking. I've also heard that if you never change it, you will lose your ranking. We do weekly updates, so I'm wondering how much change triggers a loss of ranking. (I did lose my first page ranking when I did the last major re-do of my site, but it had to be done.)
I would think you could make incremental changes like photos, "delete this", "add that" kind of thing and not hurt anything, but I really don't have a clue. I am also reluctant to believe someone who is trying to sell me something. .
How do you find out (or figure it out)?