1998 Nissan Sentra my car wont start

What is it doing-cranking over and refuses to start or No crank at all nothing.

Crank but no start:

Try doing below to determine if its fuel or spark

Get a carb cleaner and spray into the carb or the throttle body on an EFI. Did it start and die? If not disconnect a sparkplug wire or 2 and ground it to the engine -have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs,distributor pick-up coil, ignition control module, cam and crank sensors- Note: If it doesn't apply disregard it

No crank/Nothing:

Probable causes-see starting circuit

Ignition switch, clutch switch, theft deterrent relay, clutch interlock relay and starter itself

See relay box below