The short answer is; it depends. This guide is here to help you figure out how to create links to library resources that work for students both on and off campus. Keep in mind that just because a link is working for you on campus, doesn't mean a student or instructor off-campus can use it to get access.
The URL prefix should be https://ezproxy.shoreline.edu/?url= and in some cases the website will have already added this for you when you grab the permalink from the article or ebook sharing page.
When you notice numbers in the prefix, it is a hint that the link is incorrect and will not work for off-campus users. When you correct a link, you will want to do it at the asset level in LibGuides to prevent future issues with the same link.
The linking process for streaming films will be different. Please see the "Streaming Films" tab of this guide.
Some resources do not require a prefix to be added to the beginning of the link like Kanopy and Gale eBooks. These providers are essentially bouncing the links back and forth so that you can't see the true URL. Don't worry about adding or altering anything. Just copy the link as is from the resource and share.