I would never recommend keyframing everything ever. This just creates a lot of info builds up info on the time line and animation graphs. Only keyframe what you need to.

If you keyframe everything you will have a lot ot tiding up to do in the end. AutoKey is the system that automatically sets or updates changes to movement in ik handles or joints or geometry. Click the Key button to the right of the timeline and it will turn red. Autokeying is on.