Always use and store the product according to the instructions.
Keep chemicals in the original container or properly labeled.
Never mix different chemicals together.
Buy only what you intend to use. If you have some leftover, check and see if anyone you know can use it before bringing it to the Household Hazardous Waste Facility.
Look for less toxic alternatives, where possible. The links at the bottom of the page have some suggestions for alternatives to paints and solvents, household cleaners and pesticides and lawn care products.