Want more information about Connect Local database

Hello guys , I am not good in English. I apologize if some of the words is not correct or strange.

I'm a newbie for Unity3d and this time i have a problem with my game that i create about Database.

Example , I want to keep many text in my Local Database and when i start game my text that keep in Local Database is show in my game. my game is offline and not connect any website.

I want to know about how to connect Local database in C# and maybe some example.

I think this is very easy for you but it's very hard for newbie such as me

Thank for read or answer ,, :)