If using seed from packets, follow the instructions on time, depth, and watering.
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IIRC, lettuce doesn't get planted too deeply, and if planted too far down, just won't reach sunlight fast enough to continue to grow (I hope you didn't think my last answer was smart alecky, I did mean that so many just toss seeds on top, or over water, or bury them like they have already had a funeral :-)
It needs to be planted 1/4 of an inch deep. (1 cm) It needs partially shaded sites that are sheltered by the wind.
Yes, I remember the shaded part (long time since I did any gardening), as too much direct sunlight will make the the lettuce heads break open and "go to seed" early and the edible portions will no longer be edible.