It is important to keep laminate clean, as dust, dirt and sand particles may scratch the decorative surface over time in high-traffic areas. It is also important to keep laminate relatively dry, since sitting water/moisture can cause the planks to swell, warp, etc, though some brands are equipped with water-resistant coatings. Water spills aren't a problem if they're wiped up quickly, and not allowed to sit for a prolonged period of time.
Adhesive felt pads are often placed on the feet of furniture on laminate floors to prevent scratching.
Glueless laminate floors may gradually become separated, creating visible gaps between planks. It is important to "tap" the planks back together using the appropriate tool as you notice the gaps, otherwise dirt will fill the gaps making it difficult to close them later.

