There are no infinite tools in minecraft (except your hand). The closest to infinite would be a diamond shovel which gives you 1562 uses.
Some item can sub for another tool without them breaking. Try using a feather for soft block( sand, drt, or gravel ) instead of a shovel or harving crop. But when it comes to hard block then you need pick, which all picks breaks.
Try different item too.
they are in your inventory, they are infinate
When minecraft went into beta version. In alpha the world was a set size.
Yes you can ovbiously dig stone with a shovel... in minecraft
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Shovel the snow.
With a shovel
You have to destroy snow with a shovel, you can not craft it.
Use an anvil in creative mode.
You find a snowy biome, and right click on snow or get a shovel and dig it.
you rather make tnt use a shovel or use a pick
First find a snow bi om then get a shovel and dig up the white stuff from on top of the dirt with the shovel and a snowball should pop out
digs easily through dirt and sand. for more info look at the minecraft wikia