Cabbage... I am not sure if it's even worth growing them... but I will try! I had no luck with cabbage last year. Look at the list of pests/diseases! This year is going to be another experimenting year for me.
Here is the article from "The Old Farmer's Almanac" on growing Cabbage:
​PLANTING:
  • Cabbage is a heavy feeder
  • Prepare the soil in advance by mixing in aged manure and/or compost. Soil should be well-draining: roots that stand in water cause heads to split or rot.
  • Plant seedlings 12 to 24 inches apart in rows, depending on the size of head desired. The closer you plant, the smaller the cabbages.
  • For a fall harvest, direct sow seeds outdoors (or plant transplants) in mid- to late summer. If your area is particularly hot and dry, hold off on planting until late summer. Make sure that the young plants don’t dry out in the summer sun’s heat!
CARE: HOW TO GROW CABBAGES
  • When seedlings reach about 5 inches tall, thin to leave the desired space between them. If you wish, transplant the thinned seedlings elsewhere.
  • Mulch thickly around the area to retain moisture and regulate soil temperature. The optimum soil temperature for growth is 60 to 65° F. Young plants exposed to temperatures below 45°F for a period of time may bolt or form loose heads.
  • Fertilize 2 weeks after transplanting with a balanced (10-10-10) fertilizer.
  • Three weeks late, add a nitrogen-rich fertilizer; cabbage needs nitrogen in the early stages.
  • Practice crop rotation with cabbages to avoid a buildup of soil-borne diseases.
PESTS/DISEASES:
HARVEST/STORAGE  - HOW TO HARVEST CABBAGE:
  • Harvest when heads reach desired size and are firm. Mature heads will split. This will take around 70 days for most green cabbage varieties. Most early varieties will produce 1- to 3-pound heads.
  • To harvest, cut each cabbage head at its base with a sharp knife. Remove any yellow leaves (retain loose green leaves; they provide protection in storage) and immediately bring the head indoors or place it in shade. Alternatively, pull up the plant (roots and all) and hang it in a moist cellar that reaches near-freezing temperatures.
  • To get two crops, cut the cabbage head out of the plant, leaving the outer leaves and root in the garden. The plant will send up new heads; pinch off those until only four or so smaller heads remain. Harvest when tennis ball-size (perfect for salads!).
  • After harvesting, remove the entire stem and root system from the soil to prevent disease. Only compost healthy plants; destroy any with maggot infestation.
Red Cabbage 
Late Flat Dutch Cabbage
Seed shortage! I couldn't get seeds! So I got seedlings! I put them in the ground on  9/18/2020. The pictures above were taken on 10/1/2020.
10/13/2020 Compare to what it look like about 10 days ago, I can see these guys are growing pretty good!
10/23/2020 Seems like it started to form cabbage head!