Background and what to expect. No answers given away.
The crew has defined jobs
Each member of this ensemble fills a specific function that the films establish early and then repeat: the leader, the driver who came in as an outsider, the one who handles technology, the comic relief, the ones connected by blood or marriage.
Questions about specialities are asking about that structure. If you can remember what someone does when the team assembles for a job, you can usually name them.
Its origins are much smaller than its present
The first film is a contained story about undercover policing and street racing in a specific American city, with no international travel and no spectacle beyond what a car can actually do.
Questions about the beginning are drawn from that film, and if your familiarity comes from the later instalments you may not have that grounding.
One word is the franchise's whole thesis
There is a single concept these films return to in nearly every entry, spoken in dialogue, printed on marketing and parodied endlessly online. It is the closest thing the series has to a philosophy and it is the answer to more than one question here.
If a question asks what the franchise is really about, you almost certainly already know the word.
The casting became part of the story
Several performers in this series are far more famous for these roles than for anything else, and the franchise's real-life history, including the loss of one of its leads, is bound up with how the films were subsequently written.
Actor questions here are fair game because these pairings are unusually well known.
The cars are cast as carefully as the people
The first film builds its entire visual argument on a contrast between two kinds of machine: heavy American muscle on one side, tuned imports covered in decals on the other. Each belongs to a particular character and stands in for the world he comes from.
A question here asks which manufacturer is bound up with the lead. Think about what he is standing in front of on almost every poster the series has ever produced, not the exotic hardware that shows up once the films start leaving the country.
The running gags are load-bearing
Small repeated details do a lot of work in this franchise. One character is eating in a remarkable proportion of his scenes, to the point that it became the thing audiences noticed about him. Another carries most of the comic dialogue and produced a line mangled enough to have escaped the films entirely and taken on a life online.
Two questions here are drawn from that layer rather than from anything resembling a plot. They reward having watched these films casually and repeatedly, which is how nearly everyone actually watches them.