Can someone suggest me some material (links, youtube tutorials, pdf notes, ...) or some simple script in Rstudio (using maybe the iris dataset) to start studying unsupervised learning machine learning methods?

I am already familiar with classification problem using supervised learning and I want to improve my knowledge about Machine Learning models. Thanks!

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    $\begingroup$ Maybe have a look at Introduction to Statistical Learning statlearning.com (available online). You can also go for the advanced book "Elements of Statistical Learning" $\endgroup$
    – Peter
    Nov 23 at 15:11