I was wondering if it is fine to write
From this project, I have learned [blah blah], and this is the most important harvest I have received from this project.
What is a better metaphor or better way to express the meaning?
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I would say this is the most important thing I have gleaned from this project.
Glean has one definition of "To gather (something) slowly and carefully in small pieces." It also has a relationship to harvesting, with its other definition: "To gather (grain) left behind by reapers."