Consider installing an auto burglar alarm system. Don't leave anything valuable in your car if at all possible. Do not answer personal questions about the house such as type of alarm, daytime occupancy, etc. Hide or destroy boxes from computers, TV's, VCR's, etc. Don't accidentally advertise that you own such items.
Many residential doors are of wood hollow-core construction and have poor locks.
They are easily forced or kicked open. If you want better protection, you need to install solid doors and quality locks. For maximum protection, use metal doors. Do not use doors with glass panels. Many burglars enter homes through poorly protected sliding glass doors.