Neutrals
Neutral Jumps are an untaught technique that can be used to climb even or uneven walls without using any stamina. They are technically not required in the base game, however they're highly recommended to learn for the winged golden strawberry in Forsaken City.
Performing a neutral jump
In order to do a neutral jump, the player must not hold the grab button. If no directional buttons are held, Madeline only moves a short horizontal distance, allowing the player to get back to the wall and jump off of it again. If done quick enough, it's possible to slowly climb a wall without using any stamina. Doing neutral jumps requires learning a specific rhythm which may require some practice. It is highly recommended to practice it in a room with a long, flat wall and no obstacles. (something like the big room in 6A)
Usefulness
Neutral jumps become very handy for stamina conservation. Because of this, a lot of stamina puzzles can be made easier by saving stamina with this trick. It's also very useful for speedrunners or people attempting to get the golden strawberry, especially for recovery in case of a mistake or loss of stamina. Neutrals also allow the player to climb walls covered in ice, which appear in Core and in a room in Farewell.