Is there any guide to Paint.NET
Paint.NET: The Best Image Editor Available That You Should Download
We all edit images to some degree. Whether it’s a simple crop or resize, or maybe just adding some text, it’s nice to have an image editor that is reliable, fast, easy to navigate and...
The best way to learn such stuffs is to view how one does it in a video form which you can see it by visiting the below YouTube channel -
As Bruce says, there are dozens of tutorials on Paint.Net's webpage!
The creator's website includes tutorials in their forums.