HAndcraft expo shareing

Hi.. Is there any way when you share your blog posts on FB say, that it will show an image or the video you’ve added in the blog post rather than just a line of text? This is not only with this theme, seems a lot of them don’t auto supply the images/video thumbs when sharing?

Also.. can the handcraft expo blog page show images/video thumbs on the main blog page or how is this done?

Cheers