I have a 98 Ford Explorer. Was driven yesterday and today went to go somewhere and would not start. I know it is not the battery its brand new. Its not the corrosion of the battery connection. I am thinking maybe it might be the starter. Please any advice would help

First make sure its check out right. you should get a signal leaving from the ignition switch before anything. you can also try to jump the starter it will engage the solenoid if still good. try them two first

Check at the starter if it has never been changed it might have a push on spade connector that isn't making a good connection. Unplug and plug back in to see if this helps. If that doesn't work make sure you have juice on the small wire at the starter when the key is in the crank position. If it does then it probably is the starter.