Sometimes when a person knows a little bit about something, they feel like they're an expert. Because they feel like an expert, they try to do things that they shouldn't and they mess everything up.
The implication is that a small amount of knowledge can lead to overconfidence, leaping to invalid conclusions based on what you do know without taking into account the things that you don't know. It's contrasted with a large amount of knowledge, which would presumably lead one to be more cautious or to at least draw better conclusions.
It's not generally intended to imply that "even a little knowledge" is a dangerous thing. In the phrase's terms, more is definitely better.
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