The bell shows your notifications. Click it to read them.
Inside you'll find setup reminders and messages from the system. Now and then there's an announcement from the company too. Those also show as a bar you can dismiss.
A dot or a number on the bell means something new is waiting.
Nothing in the bell changes your website on its own. Reading a notification is safe.
Checking it now and then is enough. You don't need to watch it.
Why this matters
The bell is how the system tells you about setup steps and important news, so a quick look keeps you in the loop.
Related questions
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