The concepts of limits and continuity are the building blocks on which the rest of calculus rests. You should understand these concepts in terms of how you apply them and “gut feeling”—how they work.
According to College board you should be “students should be prepared to evaluate or estimate limits presented graphically, numerically, analytically, or verbally”
Squeeze Theorem Intermediate Value Theorem
I might like the unit breakdown here: https://www.humphriescalculus.com/units/unit-3-differentiation