How to improve my posts

I am really new at Envato Market, I have only uploaded one post. I would like some help to improve my publications. Could you please tell me what the procedure is to create a presentation like this one?
What can I do to upload reference images with the codes http or https? Where should I upload them from?
Thank you very much!
Looking forward to hearing from you.

link is death

place your images wherever you want, and then just insert links it below your project with the HTML scripts

Thank you so much!!