Hi there, I am new to HTML, however not to discourse.
Does anybody know how I would make an image responsive (change size depending on screen size). I’d like to add an image to a thread, and make it responsive.
Hey, welcome to Meta 
This should already work, On desktop, the maximum width for a post is about 700px. The maximum width for images is set by the max_image_width site setting. It defaults to 690px - to account for some padding. It is very unlikely for anyone to run a desktop browser window smaller than 700px.
On mobile, we give images a width based on the size of the screen. So, images will always fit not matter what phone you use.
You can see how all of this works here
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