Dandelions: Dandelions are probably one of the most well-known lawn weeds. They have yellow flowers that turn into fluffy seed heads and can spread quickly. They have long tap roots that make them difficult to remove.

Crabgrass: Crabgrass is an annual weed that can quickly take over a lawn. It has coarse leaves that can create bare spots in a lawn and can be difficult to control once it has started to grow.

Clover: Clover is a low-growing weed with small white or pink flowers. It is often considered a beneficial weed because it can fix nitrogen in the soil, which can benefit other plants in the lawn. However, it can also be invasive and difficult to remove.

Chickweed: Chickweed is a low-growing weed with small white flowers. It can be difficult to control because it produces many seeds and can spread quickly.

Creeping Charlie: Creeping Charlie is a low-growing weed with small purple flowers. It can spread quickly and can be difficult to control because it has shallow roots that can regrow from small pieces left behind.

Plantain: Plantain is a broadleaf weed with leaves that form a rosette. It has long taproots that can make it difficult to remove, and it can spread quickly.

There are many other types of weeds that can grow in a lawn, but these are some of the most common. The best way to prevent weeds in a lawn is to maintain healthy grass by mowing it regularly, watering it deeply but infrequently, and fertilizing it appropriately. If weeds do start to appear, you can manually remove them or use an herbicide to control their growth.