For me, it’s the complex variations in root canal anatomy. No matter how much I study, some canals always surprise me. I totally get your ECG struggle; those waves and intervals can be just as tricky to master as a tricky molar root system.
Agree with reading different ECGs! Another topic is the counter current mechanism of the kidneys
Any physics concepts for me. Just goes above my head for some reason .
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For me its biochem. anything with chemistry is really hard for me learn
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During my postgraduate dissertation period, I found statistics quite challenging to understand. I often felt that having someone to explain the concepts in detail would have made the learning process much smoother.
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There are many topics that I find difficult to understand.
I often struggle interpreting CT scans, and I wish some of the complex molecular mechanisms and statistical concepts could be explained in a simpler way.
Indeed, interpreting an ECG can be quite challenging! 
Pharmacology is my favourite subject because there are so many drug names, interactions, and mechanisms that it seems impossible to learn them all by heart. Some concepts simply disappear, even after repeated study sessions. We all, I believe, have that one “haunting” subject. What techniques do you employ to get ECGs to work at last? Mnemonics, flashcards, or practical experience?