My Ford F150 will not start?

I haven't had any problems at all with it starting until today, weather was fine, i drove my son to daycare in it shut it off went back out and it will not start, its was like the battery was completely dead! I tryed jumping it nothing! So i went and bought a brand new battery nope didn't do it, so started tapping the starter with a hammer and trying to start nothing, so i went and bought a new selinoid put that on and still nothing. Any idea? Like i said iv had vehicals before that if it was the starter it would gradually go. Any ideas? What this could be and how to fix?

I haven't had any problems at all with it starting until today, weather was fine, i drove my son to daycare in it shut it off went back out and it will not start, its was like the battery was completely dead! I tryed jumping it nothing! So i went and bought a brand new battery nope didn't do it, so started tapping the starter with a hammer and trying to start nothing, so i went and bought a new selinoid put that on and still nothing. Any idea? Like i said iv had vehicals before that if it was the starter it would gradually go. Any ideas? What this could be and how to fix? Thanks in advance! Not enough information.
For example, does the engine turn over when you turn the key? If not, it can be the starter, starter switch, ignition switch, or one of the fusable links.
If it turns over, the starter is probably good.
Are you getting fuel to the engine at the proper pressure?
If the pressure is too low, or non-existant, it is probably the fuel pump. You really need to isolate the problem.