There are two major parts to L.A.: The Basin & The Valley. They’re separated by a big mountain range with only a few major roads connecting them.
The Basin is on the south side of the mountain range. It’s a big square area, bordered by mountains in the north and east, and the ocean in the south and west. Downtown is at the top of the Basin up near the mountains.
South and east of downtown are generally the poorer parts of town. (Hence, South Central). The richer parts are either up against the mountains (where there are views) or next to the ocean.
Running west from downtown along the mountains you have famous neighborhoods like Hollywood, Beverly Hills, Bellaire, Brentwood, and eventually where the mountains and ocean meet, Malibu. All of these neighborhoods (with the exception of Brentwood) are actually incorporated as separate cities contained within greater L.A. – something that’s pretty common.
Running south down the coast from Malibu you have a variety of coastal communities. Some of these are independent cities (like Santa Monica) while others are just neighborhoods (like Venice). Originally the settlements on the coast were separated from the main body of L.A. by farms, but now everything flows together in a big metroplex.
As the coast turns eastward you hit Long Beach. It’s a big city in its own right. This is where the port is.
In the middle of the Basin are two hilly bits. One of them, Culver City, is where MGM (now Sony Pictures) is. The other, Century City, is where 20th Century Fox is.
The Valley is on the north side of the big mountain range. It’s long and skinny with its major axis running east-west.
At the far east end of the Valley are several old and prosperous communities – Glendale, Burbank, and Pasadena. A lot of film and TV production happens there. That’s where Disney has its offices, for example.
The middle part of the valley consists of a lot of older suburbs.
The west end of the valley (very far from the main part of the city) are a lot of newer suburbs.
Beyond the major divisions of the Basin and the Valley there are also other parts of greater L.A:
Orange County – Keep following the coast past Long Beach and it starts curving south again. That’s Orange County. That’s where Disneyland is.
The Inland Empire – Far away over the mountains to the west. Huge amounts of suburban sprawl out into the desert. I’ve only driven through it.
And, of course, there are zillions of little neighborhoods, each with their own unique character … .