The Meaning of Life, the Universe, and Everything.
Constantly I hear of people having to hold shift, where letting go for even a moment would mean their fall into the void or lava. Even Mumbo Jumbo and Joe_hills_says have fallen into the trap of having to have to hold down shift. However, if you open the accessibility settings on the main screen of minecraft
(it looks like a totem of undying) you can switch sneaking to "toggle", so you only have to press down shift to sneak, and press it again to unsneak.
Because jumping and moving is slower while sneaking toggling sneak could be more risky than holding: when you hold sneak you are in full control and can quickly maneuver, but if you're toggling your timings have to include extra key presses, and you could also forget that you have toggled sneak leading to a fall.