Lava cube: combine sun and water to make stone and combine stone and wood to make a pickaxe with that tap stone cube 10 times to end up in the caves then break 3 iron with the pickaxe after that combine 2 wood blocks to make a craft table, craft a bucket, go back to the mines then mine out enough stone to make the lava you will pick up not flow away then wait 5 seconds and thats lava cube.
Wood cube: combine 2 brown cubes.
Thats all. Thanks for reading.