
Here is a great website for the matrix multiplication demo. If you are a beginner data scientist, you will love this.
http://matrixmultiplication.xyz/
Here is how the website looks like. It has just one page. It actually shows how multiplication happens given the different dimensions of the matrix.

Fig 1. Matrix multiplication demonstration
Here are few other websites for understanding matrix multiplication concepts:
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I found it very helpful. However the differences are not too understandable for me