Will not start

Scan for codes and check fuel pressure with a gauge auto parts rent it. See link.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Remove the distributor cap and have helper crank engine over is the ignition rotor turning? We start here.

Inpsect and test the coolant temperature sensor and also check the fuel pressure then comeback with the pressure readings so that we can move on to other areas.

The car will not start when its cold sometimes, try doing below

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 problem, check the fuel pressure to rule out the fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light.

If both fuel and spark is present-check the valve and ignition timing, this will lead you to problems with compression and valves opening and closing at the wrong time

When it doesn't start, you need to check fuel pump pressure and if there is spark to the engine. One will most likely be missing. Then you will know which circuit to focus on.

You need 3 things for an engine to run fuel, spark, and commpression you say you have fuel and spark now you need to check the commpression and please let me know what you get

Most parts stores offer loaner tools you can get from there and then let me know when you get it and I will talk you though how to test

Is the starter turning the engine over or is it dead? If it is turning the engine, have you checked fuel pump pressure and have you checked to see if there is spark to the plugs?

Sounds like you might have a faulty starter. The next time it doesn't start have someone hold the key over in the ignition switch like they're trying to start the car while you firmly tap on the started with a hammer or extension. If the engine starts when you tap the starter, you'll need a starter. The starter contacts are probably worn causing intermittent starting issues.