Watch this video on youtube to see how it works in practice
If you want to show your eBook or a screenshot of your online course on the screen of a notepad, use PowerPoint. You can easily create a mockup like this without using any additional tools.
All you need is a picture with a frontal view of a laptop or notepad (download my samples here). Then open this picture in any image editing tool or software, or even in MS Word or MS PowerPoint. Insert image of your book cover or online course screenshot and place it on the screen area and adjust its size. When finished, save it as a png file with the right click of your mouse. Watch this video on YouTube to see how it works in practice.
In conclusion, remember that it is important to create a good quality book cover before you start working on its mockup. Because having a poor one might reduce your book’s success. Therefore, consider your books content and target audience when you are designing its cover. It must attract their attention either in printed or digital format if you are selling it as an eBook. Check out my book “Book Cover Design Formula” to learn how to create excellent book covers and apply the same techniques that graphic designers use.