Turn over but not start on 2000 Acura RL

Car stopped running twice last week but started back up.
Started this morning drove for 15 minutes. Tried to start later a number of times will turn over but not start. All lights, moniters that should be on are on and will turn over great but not start.

2 answers
It will need to be checked to see if it's losing spark to the plugs, fuel to the injectors or injectors stopped opening. When this is determined then a diagnosis of that system/circuit should be performed.
main relay is bad