Typically, larger vehicles have more lugs (think HD trucks with an 8-lug bolt patterns), while smaller vehicles have fewer connection points. Knowing your bolt pattern is a good idea, no matter what make/model you decided on.
A dual-drill wheel is a wheel that is drilled with two sets of bolt holes. With this additional set of holes, dual-drill wheels can accept two different bolt patterns. On all dual-drill wheels, the larger hub bore of the two bolt patterns is used to ensure proper fitment.