As I said in another thread, posting the same question in multiple threads only serves to annoy the people that you are seeking help from.
can someone help us with our project??
Help you with it? Sure. Do it for you? Sure, but it will cost you.
we need to turn on annd off home lights using the internet.. what kind/type of opto isolator or optocoupler is the best one??
Depends on your requirements, such as voltage and current.
we need all the info about automated residential lighting with online access.
Google has been known to often provide "all the info"