Step-by-step explanation:
This is trying to tell us about the importance of "basics" in every aspect of life.
The main basics or ingredient for the survival of a fish is water.
That is it's home,it's habitat,it's cradle of life and so juxtaposing it with a profession,we find out that the basics of any and every profession is Education.
Education on that particular profession.The knowledge of a profession is gotten only through the basics, which is Education,while expertise on that profession is gotten through Education and experience garnered overtime.