Dry start is where you plant your plants prior to filling the tank. You keep the humidity high by saran wrapping the top and misting twice a day. You do this over a month or more. Certain plants like hemianthus Callitrichoides will grow better this way than planting them with a tank full of water(also others plants can't be done this way). If you plant in high enough density you may not even have to do a traditional cycle as you will have good bacteria growing and lots of plants to keep nitrites, ammonia low. I'm only on the dry part and haven't added any fish to see if it works or not.