The engine rotates but will not start. What do we check? I know there is control modules that can be bad but which ones do we check? How do we know for sure that it's getting gas? I told my husband that it could have jumped time but I'm at a loss at how to check. Hopefully someone will know what to check

Have you had this truck for awhile? If so, did it do anything suspicious before it the problem: hard start, running roughly at idle, stall at idle, poor/jerky acceleration, etc?
Try pulling the codes to see if any problems were ever logged since they can stay resident without lighting the CEL.