What Calculus topic(s) should did you struggle in?

I’m struggling in Curve Sketching. I can boil everything else down to a list of procedures no matter how large, but I can’t do that with Curve Sketching.

I struggled with related rates and volumes of rotation

To be honest I started learning Calculus in 8th grade and finished in 9th grade, and it was really difficult. Of course, I didn’t know any trig, so that was part of it. Implicit differentiation and optimization were probably the hardest to grasp iirc. But 9th grade year I snapped and sped through the rest of it.