In this Inkscape tutorial, I cover different techniques you can use to remove the background from an image file (like a PNG or JPG file. Sometimes the background can tricky to remove (especially with colored image files). These troubleshooting techniques can involve different ways to trace the bitmap and even the creation of shapes!
Inkscape is a completely free vector software tool that is like Adobe Illustrator.
Links:
https://inkscape.org/
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