So Darwin's theory is wrong?!
No, it's NOT wrong -- It's foundational. Just as Einstein was not wrong even though his work has been supplemented over the last 100 years.
What you are learning as "Darwin's theory" is a lot more complicated than simply the work and writings of Darwin himself. His work has been greatly improved upon. No story about evolution would be possible without a mechanism, and at the time of Darwin there was no biological mechanism
known for evolution. Evolution, as observed by Darwin, was inferred by looking very macroscopically at different overt phenotypes, like how finches had differently shaped beaks that were adapted to their food type. But evolution, fundamentally, is NOT morphologic or functional change. Fundamentally it is genetic
change, and at the time of Darwin this was not established.
Gregor Mendel helped change that with his own foundational work in genetics; and molecular genetics has made the study of this subject so complicated that Mendel's work with peas seems very primitive. It wasn't until the 1940s and 1950s that we began to identify the molecules responsible for genetic information and their structure and function.
Furthermore, at the time of Darwin, the classification of organisms was basically derived from Linnaeus, i.e. morphological description along with the later stipulation that a species is determined by ability to procreate in nature. But species determinations are now made at the molecular level, and many organisms (especially microorganisms) have been reclassified even into different Kingdoms based on molecular work.
When I said that it doesn't matter if Darwin is wrong, that doesn't mean that he IS wrong. What that means is that he set in motion a movement that has been verified by a huge abundance of research over 150 years -- so his ACTUAL findings are incidental to our current understanding of the subject. After all, you can go to the Galapagos and make the same observations as he did. There's nothing private about his data or his work. He was just the first to string it together in the way he did.