404 pages after an SEO app, after changing URL

404 pages after an SEO app, after changing URL

tiffaninl
Tourist
6 0 1

I make a product in Shopify and it automatically makes an URL link.

Then I go to the SEO app to optimalize for Google. 
The app prefer another URL for SEO, so I changed it (Someone said its not oke for Google to do it like this, is this right?) but now all the links Shopify created is an 404 page, who will redirect to my homepage. Now Google search control says I have a lot of 404 pages. 

 

Is this really bad? Or how can I do it better?

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