I'm no expert, but I know a bit from experience. For starters, Lemmy isn't one single platform, it is made up of many different instances. Instances are the domains used to access content in the fediverse (lemmy.world, lemmy.ca, etc) using Lemmy. Each instance is separate, owned and run by different people or groups (the admins). As a user of an instance, we view and interact with content exclusively through the instance we're signed into, so a URL like the one you posted is useful information, but forces a user not on that instance to modify it to make it usable on their own. The developers of Lemmy helpfully created the shortcut I used (adding a ! in front of the community) that any user can click and be sent to the given community through their current instance.
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