The answer to 'how to care for deck' is to regularly clean, inspect, and maintain your deck to keep it in good condition. This includes sweeping away debris, cleaning the surface, checking for loose boards or hardware, and applying a sealant or stain every 1-2 years to protect the wood from weathering and damage.
Start by sweeping the deck with a soft-bristle broom to remove dirt, leaves, and other debris. Next, use a deck cleaner and a scrub brush to clean the surface, paying close attention to any stains or mildew buildup. Rinse the deck thoroughly with a garden hose. Once dry, inspect the deck for any loose boards, protruding nails or screws, or other structural issues. Tighten or replace any hardware as needed. Finally, apply a high-quality deck sealant or stain to protect the wood from the elements. This should be done every 1-2 years, depending on the product and your local climate.