Need guidance in my project

https://app.dataquest.io/m/155/guided-project%3A-predicting-car-prices/3/univariate-model

Hi,

I need help to figure out why I am not getting understandable predicted output from my train model. I have gone codeblind - cannot find my coding defects and I am totally lost with no understanding of what is going on in my project work. Please can someone kindly provide me some personal guidance in this project?

Thanks in advance