The answer to 'light fixture safety tips' is to always turn off the power at the circuit breaker before working on any light fixture. This ensures there is no risk of electric shock. Before starting, check that the power is off by turning on the light switch - if the light doesn't come on, the power is off and it's safe to proceed.
When replacing a light fixture, be sure to match the new fixture's electrical requirements (voltage, wattage, etc.) to the home's wiring. Secure the fixture properly to the electrical box and use the correct size wire nuts to connect the wires. If you're unsure about any part of the process, it's best to call a licensed electrician to ensure the work is done safely.