Why does the movement of electrons create fields?

[sophiecentaur]

no no no i think i understand now, all the fields in the electrons act a bit like a crowed of people individuals have interact with each other and the environment but they're combined interaction make the whole field right ?

It may be a good idea to approach Electromagnetism in the same way as the Science started off. It dealt with Charge sand Fields and assumed they are continuous. Forget about electrons in this context; Maxwell's Equations (well before electrons were discovered) deliver the right answers until you get way down the line into relativity. The effect of Fields on moving Charges is straightforward to calculate. But there is one little awkwardness that can arise to do with interactions, namely the question: which is charge and which produces the field? Coulombs law uses the idea of point charges and the mutual force. Does the Earth pull the Moon or does the Moon pull the Earth (same question with a different context).