Question

how do light travell?

Answer 1

light is a form of energy and travels in form of waves and always requires a medium to propagate

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Answer 2

Light is an electromagnetic wave, and a form of energy.

As light shows wave nature, it was assumed that light travelled through a medium called the ether.

But this concept is wrong. Light does not require a medium to travel.

Here's how:

The great physicist James Clerk Maxwell unified Electricity and Magnetism into Electromagnetism.

He gave the classical theory of electromagnetic radiation, which explains mathematically how electromagnetic waves propagate.

Here's a simple explanation:

Any electromagnetic substance produces an electric and magnetic field. The disturbances in these fields travel in form of wave.

You must understand that wave is a movement of disturbance, not the particles itself. In case of water waves, the disturbance that propagates is the disturbance in water, which is a physical entity.

In electromagnetic waves, the disturbance in electromagnetic fields propagates.
As electromagnetic field is not a kind of "medium", light does not require any medium to travel.