Problem: You accidentally moved a bone and want to reset the armature’s location/rotation/scale values.
Solution: Make sure you’re in “Pose Mode” and select all the bones or only the bones you want to affect, then press the following shortcuts:
If for some reason this doesn’t work, alternatively, you can always bring up the search function and search for the following term:
Note: If you are tired of watching video tutorials and would like to see more text-based tutorials like this one from me, you can support me on Patreon so I can dedicate more time to creating them.