You can subscribe to individual conversations in issues, pull requests, and team discussions, even if you're not watching the repository or a member of the team where the conversation is occurring. If you're no longer interested in a conversation, you can unsubscribe or customize the types of notifications you receive.
You can watch a repository to receive notifications for new pull requests and issues that are created. You can also unwatch a repository if you no longer want to receive notifications for that specific repository.
You can watch releases in a repository to receive notifications when a new release is published without receiving notifications about other updates to the repository. You can also unwatch releases if you no longer want to receive notifications for new releases in a repository.