this video will show you how to animate a cube transforming to a sphere using shape keys in blender. by the end of it you would not just have learnt how to make this animation but also getting a modelling tip and a good introduction to using shape keys in blender. that's why I recommend you watch it fully.
for any questions or want to make a tutorial about a specific blender topic,
please send me an email or use the comment section;
email: [email protected]