The tick command allows you to affect the Minecraft time in various fun ways. You can completely freeze the game by typing /tick freeze and unfreeze it with /tick unfreeze. Also, use the /tick rate <value> command to determine whether the game will run slower or faster than normal. You can use the /tick step <value> to allow the game to run normally for a certain amount of time when it's frozen. Use the /tick step stop command to cancel the /tick step command.
To use the time command, like many other commands in Minecraft, you first need to enable cheats. Then, open chat with the T key and insert one of the following options - /time add or /time query or /time set. The add keyword allows you to add time to your world's age. The query keyword lets you view the time that has passed in your world from the start. The set keyword is the most useful and it allows you to set the time to day, noon, night or midnight in Minecraft. With it, you can control various in-game events.
Fill command is a useful Minecraft command that you can use to make the building process easier and faster. It lets you create cubes or cuboids by providing two of its diagonal points. There are also five different keywords such as replace, destroy, hollow, outline and keep that you can use to affect the already-existing blocks while creating your new cuboids. In order to use the fill command, you have to have the cheats enabled. You can easily activate them in the world settings of the both Minecraft editions.