I got 2006 nissan altima se-r that won't start its not the battery because I check that already

. Did you check the battery by removing and placing it on a charger? Most auto parts stores will do this for free.

. Check all under hood and under dash fuses with a test light or multimeter:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-3.html#post252145

. Read the link below:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-3.html#post235560

i got 2006 nissan altima se-r that wont start its not the battery because i check that already

Any more symptoms you'd be able to share?
Do you hear anything or see the normal dash lights when you do try to start the engine?