In Need of Free Tutorials

I just started learning Grasshopper last week cos I am very in need of this. I am doing my thesis now which is an online educational game. It's very hard for me cos am only depending on tutorials. Good that I have knowledge with other applications like this that's why I never have difficulties in exploring the interface and using the commands here. But I don't know yet the advance coding and other techniques. I am now worrying if I could finish my project. Wish that someone will post any advance tutorials here. Thank you.