So when you use the resize tool in your Gimp it probably looks like this, having 8 points around the image:
(The green and red lines have been added in to visualize)
When making an image bigger or smaller, generally you'd want to resize it with the 'anchors' near the green lines - the ones at the corners.
So if I wanted to make this spurdo image bigger, I would
hold Shift before dragging the corner anchors marked in green (for paint .net)
from this:
to this:
I would want to avoid these:
and this as well (when I resize with the corner anchors without using Shift) :
Does that mean the anchors marked with red are
always bad? No, they do have their uses;
For an example, have this design:
if I wanted to make the stripes on this design a bit longer
then I would use it:
And on the other side as well:
If I wanted to make the star bigger I would just use the shape tool again to draw a new one, as paint .net does not have vector functionality - once a text or shape is created it's immediately a raster image.
There are a lot of other nuance I didn't cover like how making a raster image bigger in general being bad, but that's nitpicking and then I'd have to explain about vector imagery, vector/raster layers and making sure any "vector to raster" conversion process is proper, LOL
Honestly, I thank you for even reading this far in the first place.