#humans create artificial means of storing magic since they can't do it biologically as dragons and some other creatures can

[teethstoobigmouthwontclose]

How does Magic work? Other than the elements, how does using magic work? Are there specific requirements, or is it more a force of will? Can humans learn to use magic at all?

I've talked about how magic functions in Aethelwld previously here, here, here, and here. In short: Magic is a kind of energy. The pure form is known as "Arcana", but this is unstable and has a strong tendency to stabilise out into various elements: Fire, Water, etc. Magic produces perfection - an element is the perfect form of that thing. Complete perfection is otherwise impossible in the imperfect mundane world, and so magic and magical things often do not obey usual mundane laws.

Most flora and fauna can utilise magical energy in some way - it is a resource in the environment and they evolved various biological structures to accommodate for it.

Almost all humans can use magic in various forms. This is usually an unconscious action (like how you do not control your digestion). A person may be particularly good at gardening, or their bread always turns out correctly, or they can find lost items... All the result of unconscious use of magic. Most humans can also consciously do small magics. I wouldn't call it via force of will, unless you'd also consider "moving your arm" as an act of willpower. Conjuring flame, lights, or moving small objects magically are common abilities. Rarely, some humans can perform large magics. This does require effort, practice, and education. No human can "embody" an element as dragons can; they are mundane creatures. They cannot produce or store magic within themselves, only use what is in the vicinity.