Issues are linked together in two differen jira URLS. The goals is to automate that when the status of the issue is changed, it should also change the status of the linked issue which is in a different project or has a differen URL.
@Mahad Yalahow welcome to the Atlassian community
Across instances is a little more complicated. You should check this out https://community.atlassian.com/t5/Jira-articles/Automate-Issue-Creation-from-one-JIRA-instance-to-another-JIRA/ba-p/1439079
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