In videos 123 and 124 the assigngment of lamp arms to bones happens in Object mode with just “click object”->“click bone”->ctrl+p->bone.
In my case this didn’t work correctly. All the arms were assigned to one and the same bone. If I then change the parent of the object to the right one, it is moved weirdly perpendicular to the bone and also away from it. No matter how I apply the transforms it happens like that.
However, if I switch to the Pose mode, choose the right bone and the right object in the Outliner, click ctrl+p, then everything is assigned correctly without any weird shifts or rotations.