I think the perception of what is easy and what is hard and the contrast against what is (subjectively) easy or hard is pretty interesting.
For me I usually think it's strange when people say computers or most tech gadgets are hard because in my mind, they just do what you tell them to and you can usually just google what's up but to many people computers are still spooky magic boxes.
I also personally find arithmetic, algebra and geometry to be easy but once you get to calculus my intuitive understanding just fails me and it can take severe effort to untangle how things work and what an expression means.
One of the things I dabble in is fighting games, just looking at them it can be easy to think they're easy. After all you just move around in a 2D plane and activate one move at a time, combos are only pressing the correct buttons in the correct tempo, no different from playing the piano. If you've ever tried to get decent at one, you'll quickly learn you have to make split second decisions that require high manual dexterity and top players are the ones willing and able to spend hours and hours each and every day to achieve perfection.
If you're looking at a boat or plane captain while they're cruising, you can trick yourself into thinking they have an easy job, all they have to do is let the auto-pilot steer the craft and chill. What you don't see is all the training they have for all the situations where something goes wrong.
Something easy to overlook is also the difference between mastering a specific skill like say being able to dunk a basketball and the kind of mastery you need to get paid dunking basketballs which requires mastering all the skills involved in a basketball game like dribbling, passing, game sense etc.
Being able to do something very specific better then a professional is not necessarily hard, something I keep seeing referenced lately is Gordon Ramseys Grilled Cheese Sandwich. Does being able to make a better sandwich then that make you a Michelin star chef? Obviously not, it just makes you someone able to make a decent sandwich, being a head chef is a complete skillset that does not as a rule involve cooking sandwiches over open flame.
It's easy I think to underestimate what something involves but to me learning the basics of various crafts makes me appreciate their depths. For instance earlier this year I spent something like a week trying to figure out how to move a character model in Blender (animation software) and it made me all the more appreciate the work of animators and modelers.