This is a "Job Scam" phish. Verify that the email addresses of the sender and the person you are supposed to contact match. If they don't, that's a red flag.  Legitimate senders will usually identify themselves with a name, title, and phone number where they can be contacted in addition to an email address. 

Also, chances are that the job description has nothing to do with your background. If you are not expecting to receive such emails, feel free to ignore and also report them as spam.

This is a fake credit card application scam, pretending to give you great rates even if you have bad credit. Again, be suspicious of emails that you receive that you are not expecting. Legitimate credit card offers are usually sent via physical mail. Double check the sender address. It may say the email is from your bank, but the actual sender address may be something you don't recognize. 

This is a gift card scam. The email is supposed to be from a reputed retailer but is actually a scam. Check the sender address. Also look for subtle grammatical errors, e.g., it should be "Congratulations" not "Congratulation". Be careful of the unsubscribe links too. You may think you are unsubscribing from unwanted mail, but actually the link may be used to install malware on your device.