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I would like to know if it's a correct way to change between images, when I want to specify what image I'll want to use to mobile or desktop, using display: none and display: block. I couldn't be able to use something like backgound-image property because it got always a blank space. If you have any other recomendations, I'll be gratefull.

I'm a beginner, it's the first time I try this website! I would like to know if it's normal to use some many divs to work with flexbox, and if it's common to use so many flexbox displays on a simple project. If you think I need to fix something, please let me know, so I learn with my errors.