A short free Udacity course on making images work across screen sizes and devices in responsive web pages, covering techniques such as the picture and srcset markup and serving appropriately sized images.

Commenters call it a very good, free course that can be finished in an afternoon and recommend it for handling large images on responsive sites.

On Reddit (3)

1. Strongly recommendsWaffeBoxr/webdev2016in “How to handle huge images in responsive websites ?”

   Udacity has a really great class on responsive images that you can complete in an afternoon. I highly recommend.

2. Recommendsmountainman15r/learnprogramming2016in “Could Someone Walk Me Through HTML/CSS?”▲ 1

   You might also check out Udacity's Intro to HTML and CSS, Responsive Web Design Fundamentals, and Responsive Images courses (in that order). They're all free and you should have a much better idea on how to build a website from scratch and which tools to use. By the end of those courses you will…

3. Recommendsshinobiwarriorr/webdev2016in “How do you compress your images?”▲ 1

   Here you have a very good course on ersponsive images https://www.udacity.com/course/responsive-images--ud882?linkId=20115590 (FREE!!)

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