The 3R's are a waste management strategy that involves reducing, reusing, and recycling: 

Reduce

Limit the amount of materials and goods you consume. You can try the three-day rule to avoid impulse buys. 

Reuse

Find a new use for items that you might otherwise throw away. For example, you can reuse containers, wrapping paper, plastic bags, boxes, and lumber. 

Recycle

Give materials a new life by turning them into new products. You can recycle glass, plastic, aluminum, and paper.