Methylation data analysis using unsupervised hierarchical clustering

Hi there.

I have some methylation array data (EPIC 850k) and I'm trying to analyse these data by using unsupervised hierarchical clustering.

Is there any tutorial?

www.datacamp.com/community/tutorials/hierarchical-clustering-R
I found this site, should I start with beta values of methylation data?

Many papers used Euclidean Distance, but I have no idea where to start.

Thanks.