How to make a connection between data?

Question

Laravel

Hi all. Advise how to make data connection among themselves.
For example, I have articles to which I set "keywords"
I also have more videos to which I also set keys And
there are, for example, goods
which have the key that this article has. And so for each (video, product) to select such intersections. But I need to make sure that if I add a new video with a key, it automatically clings to the desired article , I
tend to tags, but there may be another solution
Thanks for the answers