how will I use steam API to get the info on a game if they search a game name in my website , I'm new to using API's please help!! example : I need to get the games minimum requirement in my website from steam
Take a look at Steam's Web API Documentation:
https://steamcommunity.com/dev
That should guide you through all the process. Make sure you read everything carefully so you won't miss anything!
These might help you:
Replace STEAMKEY
in the url to your desired Steam Key.
Replace App_ID
in the url to your desired Application/Game ID.