Firstly what's rigging? First time I heard about rigging was in the previous term. We had a lecture with a guest from Ninja Theory who told us that there is need for riggers in the games industry. Shortly he explained that rigging is actually putting together pieces of a model so it can be animated. For me it was one of more obscure jobs in the industry.
During todays lecture we learned about hierarchy of objects and parenting. We were also given a usefull link with plenty of tutorials. http://www.guerrillacg.org/
Parenting is aligning pieces of an animated object in a way that one is stuck to the another one, in such a way that the parents moves affect the parented object but not the other way around. This means that if the parent is a plate and an orange is parented, when you move around the plate the orange will stay stuck to it, but when you grab the orange it will move without the plate.
To parent an object in Maya firstly we click the object that is supposed to be parented holding shift and then the parent and then click capital P.
With some objects we need to change to center of pivoting by clicking Insert and manually finding proper place for the center.
Another problem I stumbled across is that some objects after being resized tend to change shape when pivoted. That can be solved by freezing selection.