How to create category filter

Hi all, I would like to create a filter based on the category of my projects. I watched multiple tutorial but I still couldn’t figure it out.
What i meant by “category filter” is like below:

What I have done in my CMS right now is that I createdmulti reference set for my category:
image 1
Then from each project I’m able to add the category tag
image 2
Here is the read only link of my website

What should i do for next? Thanks a lot!

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