USPS “Forwarded”: what it means
“Forwarded” means USPS is sending the package on to a different address, usually because of a mail forwarding request.
Why it happens
Someone at that address filed a change of address with USPS, so mail for them is redirected. It can also happen when the original address can't be delivered to and USPS has a better one on record.
How long it adds
Usually a few days, since the package has to travel to the new address. Tracking may go quiet while it does.
If it's going to the wrong place
If you didn't move, contact your local post office: an old forwarding order from a previous resident can catch your mail. Then tell the seller.
Other messages: every common tracking status, A to Z.