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Improve front-end using responsive web design

I know said there breakpoints mean change size up and down. You can see different all devices, sizes, I explain how to make build a full website size 992px move to 991px done OK. You should must learn to front-end responsive web design? Can using HTML and CSS which is JavaScript. You can choose framework Bootstrap, Webflow, WordPress, Weebly, Wix, any. You will web project examples; portfolio website, etc.