Proper car seat installation is crucial for ensuring the safety of young passengers. Begin by reading the car seat manual and your vehicle's owner manual to understand the specific requirements. Most car seats can be installed using either the LATCH system or the vehicle's seat belt. Ensure the seat is secured tightly and does not move more than an inch side to side or front to back. After installation, check the harness system to ensure it fits snugly against the child's body. The harness straps should be at or above the child's shoulders for forward-facing seats and at or below for rear-facing seats. Regularly inspect the installation and adjust as your child grows.