If in the website data shows different websites on it when I never went to them what does that mean ??

In settings -> Safari -> advanced -> website data? That will include sites where the primary site you visited pulled content from. So for example if you went to www.Amazon.com, you’ll likely see other Amazon sites like ssl-images.Amazon.com or media.Amazon.com. You may also see sites for advertisers on the site you visited as that site pulled data from the advertisers servers. So it’s not uncommon that there will be a bunch of odd URLs there that you didn’t specifically go to, but represent sites with data displayed at or in the sites you visited.