Organic Farming starts from the seeds stage to harvesting of a Pesticide free growing which is a safe food initiative by the modern farmers.
To cut short, Organic food is chemicals and pesticide free crops raised for safe food loving people.
Even Simpler, Cancer Free food ( See the video below to believe it )
It starts from the basics which is selection of seeds.
Heirloom seeds, Non-GMO seeds,
Compost tea or organic soil,
Fertilizers, Manures etc.