Magic in this universe is like a muscle, the more you use it the more powerful it becomes. Transfiguration in particular is mentioned as being extremely dangerous, but learning early in life gets you disproportionate gains in your adult transfiguration, hence why they even teach it to children.
Dumbledore is probably just building up Harry’s strength by constantly exercising his ‘transfiguration muscle’.
Magic in this universe is like a muscle, the more you use it the more powerful it becomes. Transfiguration in particular is mentioned as being extremely dangerous, but learning early in life gets you disproportionate gains in your adult transfiguration, hence why they even teach it to children.
Dumbledore is probably just building up Harry’s strength by constantly exercising his ‘transfiguration muscle’.
Wax on, wax off.