DD Kisan had a detailed episode on water based plants which can be grown on the terrace, including information on water lilies, lotuses, water chestnut, lettuce and other water plants.
However the main problem which most people who wish to grow plants on their terrace, is finding suitable suppliers of these plants
In most towns, and some cities of India, there are few suppliers of plants which grow in water
The google competitor had collected a large number of plants growing in water, however they were all stolen in 2017-2018, allegedly by google associates in panaji, goa were involved in home intrusion
They could easily contact suppliers and feature them, get some money from advertising