display multiple categories on a post

by default wordpress themes display one category per post
i want to display multiple categories per post like lets say limit to max 4 categories

so if i attach a post to like 4 categories it will display all of them for that post rather than just 1

how do i do this? i see this often where a post can have multiple categories but no where to find how to do this anywhere i have searched

I believe there is a function that queries the categories and return all the categories for the post. Being that wordpress is heavily for blogging and i will assume they understand instances where multiple categories per post..so why not have an option to display this by default?

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