I am totally new to stock and their trading. I have questions when I was trying to understand an account at a brokerage company:

Account 12345678(Margin)
Net Liq Value   $23,416.36 
Buying Power - Stock    $27,064.61
Buying Power - Option  $13,532.30
Cash Balance    $3,648.25
Unsettled Cash  $0.00 

I was wondering

1. what are the meanings of Net Liq Value and Cash Balance?
2. What are the meanings of Buying Power - Stock, Buying Power - Option, and Unsettled Cash?
3. How much money does the account have currently?

Thanks and regards!