Kmeans clustering is used in all kinds of situations and it's crazy simple. The R code is on the StatQuest GitHub: https://github.com/StatQuest/k_means_...

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0:00 Awesome song and introduction
0:33 The Kmeans clustering algorithm
4:26 How to pick a value for K (How to use an elbow plot)
6:06 Kmeans vs Hierarchical Clustering
6:28 Kmeans clustering and 2Dimensional data
7:08 Kmeans clustering and heatmaps

Corrections:
5:58 I should have put "Reduction in Variation" instead of "Reduction is Variation"
7:25 Point (7,8) should be in the lower righthand quadrant.
8:25 The "nclust =25" in the arguments is actually "nstart=25"

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