First of all, an image will always be rectangular with vertical and horizontal sides. You can not have one leaning at an angle. That is the way raster (bitmap) graphics work.
The video is for Gimp 2.8. Gimp 2.10 has a slightly different interface and most probably a very dark (default) theme. Otherwise exactly the same.
There are ways of changing the theme but sticking to rotating.
Using the rotate tool
, check the Interpolation (1) Clipping set to adjust (2) and if you want guides set them (3)
Click in the canvas to free-rotate (4) or use the slider. Whole angles use the dialogue (5) If you need to detach that little entry box use that upward arrow (6)
Click on rotate and that gets this:
The yellow dotted line is now the layer boundary (7). Increase the canvas size to fit Image -> Fit Canvas to Layers (8)
Which gives this:
Save as a Gimp xcf if you intend more editing. Export as a .png image to keep the transparency for printing / web use etc.
This will be the same for Windows / OSX / linux
The video is for Gimp 2.8. Gimp 2.10 has a slightly different interface and most probably a very dark (default) theme. Otherwise exactly the same.
There are ways of changing the theme but sticking to rotating.
Using the rotate tool
, check the Interpolation (1) Clipping set to adjust (2) and if you want guides set them (3)Click in the canvas to free-rotate (4) or use the slider. Whole angles use the dialogue (5) If you need to detach that little entry box use that upward arrow (6)
Click on rotate and that gets this:
The yellow dotted line is now the layer boundary (7). Increase the canvas size to fit Image -> Fit Canvas to Layers (8)
Which gives this:
Save as a Gimp xcf if you intend more editing. Export as a .png image to keep the transparency for printing / web use etc.
This will be the same for Windows / OSX / linux