What is Spectral clustering? What is spectral clustering?
I have little background in statistics. I have tried to search for notes online but they assume quite a lot of knowledge. 

Would be good if you are able to find some notes online which teach the basics and the math foundations for spectral clustering

I have found notes like this one which require a lot of background knowledge which are not suitable for me
Spectral clustering is an algorithm for data clustering that uses the spectrum (eigenvalues) of the similarity matrix of the data to perform dimensionality reduction before clustering in fewer dimensions. 

The similarity matrix includes the relative similarity of each pair of points in the available dataset.