VaughanJB
Scrappy VIP
In evolution, the "ancestral line" isn't one straight line that starts with an amoeba or a microbe whatever and ends with a modern day human. So far, scientists of evolution, archeology, and ancient history and ancestry have discovered dozens of ancestral lines that don't all connect to one beginning or even to each other. They've found various hominids and humanoids that don't share any DNA with each other.
There is nothing concrete in the study of evolution that proves where humans began. Lots of theories, no Holy Grail.
The lineage back to water is well documented. But as you suggest (if I have this right), the idea that we directly evolved from fish is incorrect. We didn't. We're on different branches of the tree of life.