this post was submitted on 15 Feb 2025
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There's actually no harm in commenting on communities from another instance!
Often there will be one large community for each topic, on some random instance, rather than individual communities on every instance. The diagrams on this doc might help to see how it works: https://fedecan.ca/en/guide/lemmy/for-users/detailed-overview
It is possible that a community is intended for a certain group of people, and ideally the community name will indicate that. If not, you can open up the community and check the sidebar. For example, !medicine@lemmy.ca is named 'Medicine Canada', and it is intended for Canadian medical professionals / Canadian medical news, while !medicine@mander.xyz is named 'Medicine', and it is the general community for the topic.
We didn't have to make 'Medicine Canada' on lemmy.ca, and in fact, there are many non-Canadian communities on lemmy.ca. It all comes down to what the community mods want the community to be about. The instance is just where they chose to set up shop.
In your case, the sidebar at !aliexpress@programming.dev says:
When in doubt, just check the community sidebar :)