Simply upload images to a specific post in WordPress, and select the „Gallery” post format, and it will automatically turn into a nice slider. It also smoothly resizes the slider height depending on each image’s size.

Check out this link format post, the custom fields will only ask you for the title of the link, and the link itself. Then you can of course also add a description below, like this, using the normal textfield.

This is a single image post – the only difference to the gallery post is that it only shows one image, not multiple. Responsive, any image height.