Best online course for project finance modelling?

Hey guys, I was wondering if anyone can recommend a good course for project finance modelling? I have gone through basic tutorials on youtube in excel, and am familiar with intermediete financial modelling. I don’t want to pay an arm and a leg…there seems to be options like WallSt Oasis, BIWS, Chandoo and so on…not sure which is best if i am only interested in project finance though…