Debut: Expand / Collaps when clicking on "+" / "-" sign

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Hello together, 

I'm trying to get my onlineshop ready but I need your help First things first: I'm not a coder therefore sorry for not having the correct words for it

On a product page I would like to show a headline and next to it a "+" sign (which switches to "-" in case I want to collapse the text again) to expand the description text. I hope you understand what I mean - if not please find a example attached.

Thanks for your help!

example expanding_collapsing.png