Hover on link in div a reveals content in unrelated div b

[carloshernandez.me]

concept…
I have “a href” in one column in a three column layout. and when I hover on it, I want another “div” in the second column to either reveal some content or change its visibility from hidden to visible.
Ultimately the left column will be a nav of icons and the other two columns the corresponding content. I am a beginner trying to learn so any help would be appreciated. maybe even point me in the direction where I can understand this further.

problem…
I have tried to read some of the threads on here regarding this topic, but most seem to be siblings or nested or very different in concept so its hard to get my head around it.

here is my codepen and thanks again.
http://codepen.io/carloshernandez/pen/pjeOyY?editors=110

[carloshernandez.me]

Thanks Paulie_D, Technically they are all inside a wrapper does that make them siblings? I’m still reading up

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