Automatic Keyframing

In the Timeline Editor (at the bottom of the default interface, this editor allows you to define the duration of the animation, play it, scroll through it, and so forth), there is a little button on its header with a red circle in it, similar to the Record button on old radio cassette players. If you press it, Auto Keyframing is enabled. With this option, every time you change something, a keyframe will automatically be saved for it. While this is really useful when you’re animating, as it lets you insert keyframes just by moving objects in the scene, you have to be very careful with this method because if you forget it’s turned on, you may keep saving keyframes when you don’t want to.