How to move blocks by clicking?

I have Minecraft Java and wonder how it works, that in the creative mode of inventory with a single click a block into your own inventory can take. Because you normally click on a block which you then have to move to the inventory.

You move the mouse pointer on the block you want and then press a key from 1 - 10. In this slot landez then the item.

Alternatively, a click with the mouse wheel on a block

No, because you only take one steak

If you want to take a stack, you have to press Shift.