I may sound a little nerdy, but you will need me to get into your house

In the crown of a giant, a nut is born, Future oak dreams hidden in its form. A cap it wears, like knights of yore, Guarding the forest's future lore.

I am a third place medal, what is my color?

I’m shaped to match a mystery, and carried for the day. You need me to open something that won’t move another way.

On sunny days, hugging feet in a breezy way. With every step, I softly say, Feel the balmy sway!