While Going through the book Rich dad,poor dad my mind refrain back to this; INVESTING FOR A REAL ASSET

And it says a true luxury is a reward for investing in and developing a real asset.having read that I was contemplating and as well need clarification for this.If BTC is an asset.because it was said that an asset is money in your pockets,so how does BTC relate to being a real asset,and what is a real asset and how do you invest for a real Assets.