Q.Do I Need To Put Rocks In The Bottom Of A Decorative Pot When Planting A Gardenia?
I received plant as a gift and want to place it outside in a decorative pot

Certified GKH Gardening Expert
As long as your container has plenty of drainage holes, then it is not necessary. It can be helpful, and I do so myself, but it isn't necessary for the plant's survival.
This article will help:
https://www.gardeningknowhow.com/ornamental/flowers/gardenia/gardenia-plant.htm
If you choose to grow it indoors, instead, then this article will help:
https://www.gardeningknowhow.com/ornamental/flowers/gardenia/growing-gardenias-indoors.htm