They ask you to pay
Real employers never charge to apply, train, or hire.
Hired without an interview
Got the job after only a text? That is not real.
They send you a check
They ask you to send part back. It will bounce.
Too much money offered
Mystery shopper, reshipping -- common scam covers.
Pressure to decide now
They need your SSN before you have signed anything.
Strange links or emails
Gmail instead of a company address is a red flag.