A splinter smaller than a quarter and a crack smaller than 3 inches can be easily repaired with an epoxy repair kit, but a larger crack or chip may need a professional product or a complete replacement windshield. Make sure the kit completely covers the size of the vehicle's crack or chip before starting the repair process. Charles, take your vehicle to a reputable local glass shop. They will be able to tell you if it can be repaired or if it needs to be replaced.
You should not attempt a home repair with resin. Generally speaking, if the glass has a chip or crack smaller than six inches, the windshield can be repaired. If the crack is larger than six inches, the windshield may need to be replaced. While there are kits you can buy to repair a chip or crack in your car's windshield at home, these kits are often of low quality and don't provide a durable or effective repair.
Chips over a quarter of a dollar and cracks more than three inches long cannot be fixed with a DIY kit and must be repaired or replaced by a professional glassware service such as Glass Doctor.