Took car to dealer got new battery, starter is fine and so is alternator. Get home and nowcar wont startagain

Hello, anyone's guess as to what's wrong, starting with a new battery not being effective, then possibly a wiring issue, cabling issue, questionable starter motor testing, start stop button concern (if equipped), and so forth. Testing is needed. That's all I can say, unfortunately. Hands on testing. www.repairpal.com/repair-shops