Makes you immortal
Nothing can hurt you. In practice you do not die, including from enemy damage, falling and drowning.
The power menu is where the real cheating happens in Journey Mode. You can turn on godmode and never die, freeze time at any hour and switch off the rain. The enemy spawn rate slider is the most powerful option. Pull it down to zero and no enemies spawn at all, push it to the max and they keep pouring in.
Most codes here need cheats turned on first. See the section on how to open the console.
Pick Journey Mode when creating a character
Nothing can hurt you. In practice you do not die, including from enemy damage, falling and drowning.
Lock it to night or day. Ideal for keeping it daytime while you build.
Turns rain and wind on and off, so you can lock in the weather you want.
Pull it down to zero and no enemies spawn, push it to the max and they keep pouring in. The most used power while building.
Power menu > Difficulty Slider
Slide it anywhere from Journey to Master. Enemy health and damage change accordingly, and you can change it back at any time.
Power menu > Increased Placement Range
Boosts your block placement and item pickup range from 10×7 to 37×33 tiles. It is on by default and saves you from constantly moving while building.