Hii Nanda!
There are a wide variety of courses which you can opt for after completing your BSc in agriculture. Every course has its own importance, and specialization and future benefits ,so you cannot label a course to be best or worst. But, let me tell you list of courses out of which you can opt for the ones you feel like doing or have interests in. Some of the courses are - Agronomy, Soil Science and Agricultural Chemistry , Plant protection, Food Science, Forestry, Plant Breeding and Genetics, Plant Pathology, Horticulture, Entomology, Biotechnology, Agricultural Economics and Farm Management etc.,
While completing your BSc you will definitely get inclined to one of the subjects or fields and will come to know your interests. Thus, decide accordingly. Bole this helps.
All the best!