Sow: Seeds into beds thinly. Drills about 1/2" deep and 12" apart.
Then thin them out about 6"-12" apart, depending on the variety.
Care: Lettuce loves cool weather. They do not like heat. If you grow lettuce in the winter it can tolerate the cold. However, use a cloche, hoop-house, cold frame or plastic wind tunnel if temperatures get to cold.
Harvest: Cut outer leaves and use as needed. Additional leaves will continue to grow or cut the entire head depending on the variety.
Containers: You can grow lettuces indoors or out in containers. Sow the seeds directly into containers or sow a few seeds in seed pots and transplant when they reach about 2" inches. It's best to plant the seed directly in the area they'll mature in. Lettuce really doesn't like to be transplanted. However, I've had great success in transplanting. The above lettuce we started from seed outside and later transplanted into a larger raised bed.