Can you use electronic tickets for entrance. From Stuhub or Seatgeek

Yes.

You have to make sure it has the barcode for them to scan if not then you have to go to ticket booth and show them your online purchase to get tickets with a barcode on it

Yes you can get electric tickets from StubHub 4 seat geek

Yes but they must be on your phone so a barcode/QR code is available to scan. No full-sheets paper tickets are accepted at the time of entry. If you have full-sheet paper tickets that you have printed at home, be sure to check with the stadium's ticket office prior to entry into the building.

yes you can.

Of course