HowNow is great because you can personalise the platform to really make it suit your business - if you're creating assets for the platform it's handy to know which sizes you need!
Visit Settings on your Dashboard, and scroll to the bottom of the page. Hover over the 'i' icon and you'll see the relevant measurements displayed. Easy!
We also have a handy video guide if you'd like to take a look too:
Learning Space Header Image, Lesson Header Image, Course Header Image: 1440x600px
Card Thumbnail images: 640x340px (maintaining an aspect ratio of 16:9)
Note: Uploaded images are automatically resizes according to your screen size or resolution. For this reason, we don't recommend including text on your header or thumbnail images as these could be cropped or overlaid with content titles!