I have a beginner question for you if you don't mind.
I'm just now studying up on this whole SEO thing, and have found out it is a pretty big deal. I use a lot of modifications on my shop, including a POS that is integrated with my database, and a mobile template for my shop. I've wanted to install this add-on for so long, but two things have scared me into not doing it.
#1: I don't know if existing links out in internet land will no longer work. When the new URLs are generated, do the old ones break?
#2: Will my internal stuff, (such as my POS and mobile shop) break?
I would really appreciate any answers you can give me, and it will probably help others as well that have questions such as this. Thanks in advance!