數學 - linear algebra review
說到數學補腦好幫手，一定要推薦 Khan Academy ! 生活良伴，時不時看一看，身心清爽， ~發大財你 xX~，用過都說好棒棒。
機器學習 - parameter learning
Gradient Descent : article
機器學習 - model and cost function
Model Representation : article
Housing Prices
Supervised Learning:
Regression Problems 
Classification Problem...
機器學習 - introduction
What is Machine Learning?