Courchevel is a collection of different villages all with different character. The highest and most famous is Courchevel 1850 where the wealthy can arrive at it's private airstrip and eat in it's Michelin star restaurants - the village is full of high class hotels and chalets but also has plenty of affordable accommodation and restaurants as well for the less well-heeled. Lower down, you will find Courchevel 1650 and 1550 where you won't find the swanky accommodation but a good choice of apartments and still the village atmosphere. Lowest of all, at Courchevel 1300 (Le Praz), you will find a traditional village with a good atmosphere and the Olympic ski jump built in 1992. All villages have gondolas connecting them together so access to the skiing is easy.
The pistes of Courchevel are extensive with 150km to try out - they are well groomed and maintained with varied terrain to suit everyone from beginners to experts. Piste marking is on the "easy" side so you have little risk of finding yourself on a piste harder than you expected.
For nightlife and non-ski activities, Courchevel 1850 is undoubtedly better equipped than the other villages with a wide choice of bars, pubs, restaurants, piano-bars and nightclubs to choose from. There are also plenty of other activities - a bowling alley, ice rink and sports centre among them. The other villages all have plenty of bars and restaurants though so you won't be stuck for places to go.