What is the limitation of H1b visa holder?

H1B visas last 3 years. You can only have two and then you have to apply for a Green Card or return to your home country. Your wife and child can get H4 visas if you have a H1. Your wife would not be able to work legally on an H4 but your child can attend school. You can get a driver's license with an HI. You can only legally work for the company named on the H1B visa and no other company.