I tried baking a cake for the first time. The brief procedure I followed was:

* Mashed 4 eggs. Added to it 1 cup sugar, 200g butter. Mixed it using an electric mixer.
* Then added to it 1.5 cup of all purpose flour. Mixed it thoroughly again using electric mixer.
* Baked it at 180 degree celsius for half an hour.

But the end product was **not light and fluffy at all**.

It looked something like this:

![I cut open the entire cake](https://i.stack.imgur.com/ObSzS.jpg)

My question is:

**What actually went wrong with this cake? What can I do so that I do not end up making a cake like this in future?**

I want to make a normal cake which is significantly light and fluffy.

Thanks.