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I had difficulties with the responsive of the site, especially the mobile version. I didn't know if i only had to do with 375px width screen or all the width screen from 1440px to 375px. I finally decided to do it from 1440 to 375px.

Do you have any advice for me for my future challenges for the responsive? Especially on the screen sizes that i must focus on, or websites that can help me to improve it.

Thanks !