“How do you like it so far?”
You just met a new employee at your company who has been working there for a few days. After introducing yourself, you make some polite small talk.
How do you like it so far?
This is how you ask for someone's general opinion of something. It's similar to asking "Do you like ___?" but it's a more relaxed-sounding question. You usually ask "How do you like ___?" when you're first finding out what a person thinks about a new situation:
How do you like your new house?
How do you like working with Randall?
So how do you like California?
A good answer to "How do you like ___?" is something like:
It's been pretty tough, actually.
You might mix "How do you like ___?" with "What is ___ like?" but they're different. Ask "How do you like ___?" to get someone's review or rating. Ask "What is ___ like?" to hear a description.
I like it so far.
As another example, if you bought an old used car and your friend asks if you've had any problems with it, you can answer:
So far it's running just fine.