2004 Nissan Titan not starting

Do you hear a rapid clicking of the starter. This is the solenoid. The starter could be bad, or the electrical connection to the starter could be bad. Try checking the wires to the starter and make sure they are tight( including ground wires) you might have a bad/stuck starter or worn flywheel teeth if you have confirmed that all the electrical connections are good but it still won’t work

This is the symptom of a parasitic battery drain. Usually caused by a computer module that's not going into "sleep" mode. It stays awake and continues to draw power. If you have a good ammeter you can try diagnosing the problem to find out which circuit/module is drawing power. But it can be tough to find. Here's a step by step to finding the culprit: https://ricksfreeautorepairadvice.com/battery-dead-morning/