Was the car running before?? What are the events that led up to not starting? How old/condition of car?
Keep your search simple. Then get complicated later.
No start - three basic needs are fuel, air, and spark. Oh and a good battery.
Fuel - no tools? Assuming tank has adequate fuel and fuel is good (not very old). At a minimum, turn key to on. Wait 2 seconds for fuel pump to stop (you should hear the pump - if you dont - problem). Then key off. Then unscrew cap on end of fuel rail. Press valve in rail with pen tip or screwdriver (keep a rag right there). Should spray out fuel. No spray - problem.
Air - assuming no blockages. Filter clean. Try cranking with throttle lightly depressed. NOT fully depressed.
Spark - get a spare plug, any plug, pull a boot, attach boot to plug, lightly visegrip the plug body to something metal for grounding and in a place where you can see it. Crank. Should see spark. If you don't - problem.
Battery condition/voltage?
If these simple checks find nothing, then your problem is more complicated and may involve electronic signals, mechanical timing of events and so forth. Report back and we can get more complicated from there.