Like terms are terms that are similar, like just numbers: 2 and 5, or numbers with coefficients: 6x and 4x.
In the boxes with like terms (like 5, -4.2) will be put in the like terms box.
The terms like these: 1.4y, -5y^2 and 1.4y, 5, -4.2,-5y^2, z will be just terms.
I hope this helps. :) Comment if you have any more questions.