I will never learn React like this. What is this error?

Question

JavaScript

Answer 1

You can’t learn React without learning Javascript, I recommend starting with JS, otherwise there are still a lot of surprises waiting for you

Answer 2

In line 3, the compiler did not understand the construction you wrote and assumed that you declared Header as an unassigned constant, and after it an anonymous function, so he assumed that this was not inheritance, but an enumeration of constants and suggested putting a comma after Header, but in your case you did not write the assignment sign (equals) for the Header constant of the anonymous function.
const Header = () => {…}