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FIELDS
Not much to worry about here for younger years (but see the Magnets section); but there are still plenty of things at school level that can be tricky:
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GENERAL
Relationships between Field equations for Force, Field strength, Potential and PE
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GRAVITY
Gravitational field lines (and g) inside a planet
How tides are caused, and how their action affects the Moon and Earth
Why are gravitational field strength and acceleration due to gravity listed separately?
Why is g always quoted as being 9.81 ms⻲? How different is my local value?
ELECTROMAGNETISM
Phase Relationships in Transformers
Magnetic 'Circuits' - equivalences between electricity and magnetism
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