Eigenvalues are a topic in linear algebra. They're coefficients you can put in front of some matrices or vectors that change their magnitude.

Linear Algebra was the most useful and fun math class I took in college. Highly recommended if you ever wanna do gamedev. It's more approachable than you probably think.

For me, when people start talking about differential equations, specifically the symbols you'll see in a wikipedia article about Navier Stokes equations, I'm just a business-rule caveman with a little linear algebra zug zug.