it might be useful for beginners. this is how i make my own gift image:
1. I design my image by using AutoCAD so that i have consistent dimension. For example i need to design a Fan/propeller.
2. In AutoCAD, i will create 3 or more frames with the same basic dimensions. (with different rotation angle of the fan blade) see first attachment. I then assign color to the file. cut and paste them on Microsoft Paint and save them as jpeg or png.
3. then, split the image to individual files (you can also leave it as a single file also because you can still edit it as individual file in software in the next step).
4. Open the png maker software and open your created jpeg or png. I use this one:
https://pixlr.com/ you can find the tutorial on how to create the png using pixlr on youtube
save the completed png image (with transparent background) as png.
5. create your gif image using this:
https://ezgif.com/maker you can set the speed of your gif image.
6. upload your image to the AHMI gifanimator tool.