Green side up- Container gardening for complete beginners

Growing up on a nursery, surrounded by plants, I have seen millions of plants grown for growers, farmers and individuals over the years. My achievements to date include planting a bulb garden (aged 5) which was subsequently buried under a bonfire and growing a reasonably sizedĀ sage plant in the family herb garden so I can hardly be considered an expert but, from my new flat, I am hoping to start gardening in my adult life with this one golden rule: green side up!