It's wrong to take credit for the work of others.
Kevin is working on a project at work when he sees that someone has already created a solution that is free online.
Kevin wants to use the free solution.
Kevin takes the solution and uses it, then tells his boss where he found it from.
Kevin implements the free solution and tells his boss that it was all his idea.
Kevin's boss congratulates Kevin for his resourcefulness and thinks realistically of Kevin's abilities.
Kevin's boss thinks that Kevin is more capable than he really is and gives him huge projects, stressing Kevin out.