Normal wear and tear to the unit are not charged to your account. However, resident damage is charged to your account. So, to prevent damage, here are a few suggestions:
NEVER remove smoke detectors.
NEVER leave food cooking on stove unattended.
If an outlet is not working, check breaker box and reset if needed.
Never dump cooking grease down drain lines or toilets. Once the grease sets up, it can plug your drains.
Never flush feminine hygiene products down the toilet.
If you do plug a drain, have a plunger handy.
Keep your unit keys in your possession at all times. Leave a spare key with a trusted relative, friend or neighbor.
Keep your unit clean. Cleanliness keeps away unwanted pests.
Know where the water shut off valves are. If you happen to break a pipe or faucet, the chrome handled valves under the sinks and toilet can shut down water to the problem by turning the valve handle clockwise as far as it goes. Remember, "righty-tighty and lefty-loosey."