What is involved in culture?

There are several different definitions about exactly what a culture is. Thing is that since cultures are so diverse that there's really no one umbrella definition to put them all under. Most anthropologists agree that it can largely be defined as a group of people that share a set of values and/or norms and/or rituals and/or practices and/or live geographically close relative to each other (after the rise of web 2.0 culture that last one has been heavily contested).

As a n anecdote, because cultures are too diverse to define with one definitions, anthropologists no longer look for one definition, but define them all as different. To get a more coherent answer, you should ask about a specific culture.