Inkscape Tutorial: A really quick way to change the width of a Stroke
http://usefulgraphicdesigntutorials.com/
Inkscape Tutorial 2017 - using Version 0.92
Welcome to this Inkscape Video Tutorial! Inkscape is an amazing program that is almost as good as Adobe Illustrator, but it's FREE!
This Inkscape tutorial demonstrates how to quickly change the width of a stroke (outline) around an object
Inkscape is not a bitmap editor, like Photoshop, but rather it is a Scalable Vector Graphics (SVG) editor. An advantage of SVG editors is that they allow images to be scaled without a loss of resolution (quality).
Inkscape will allow you to convert your created image into a PNG bitmap image, at the desired resolution, using the export function under the file menu. We have other videos covering this.
The resulting PNG file can be used in web pages or read and modified using GIM/Photoshop.
Note however that once the image is converted to a bitmap image, a loss of resolution can occur if the image is resized.