How do you easily copy a block from the terrain into your inventory in creative mode?

I was watching some Grian videos and I saw in one of his videos he sort of copies a block and it puts the block into his hand instantly. How exactly does he do this? (by the way he is in creative and he also is not in his inventory).

Solution 1:

As long as you're in creative mode you can middle-click to copy the block you're currently looking at. You have to be close enough to the block that you could interact with it, and it creates a copy of the block type rather than a true copy (copying a chest doesn't copy the contents of the chest).

You can also do CTRL + Middle click to copy contents of container objects. This includes chests, dispensers, hoppers, command blocks and others.

You can also do it in survival mode, but rather than creating a copy of the block it will just take it from your inventory instead (as long as you're actually carrying that type of block).