Classifying polynomials by how many terms they have is really simple once you understand it. Let’s break it down:

1. Monomial: This is just one term.
   For example, $4x^2$ or $-3y$.

2. Binomial: This has two terms.
   For example, $2x + 3$ or $x^2 - 5$.

3. Trinomial: This one has three terms.
   For example, $x^2 + 2x + 1$.

So, to remember: the more terms you have, the higher the classification!
Once you get the hang of identifying these, it makes factoring polynomials a lot easier!