Looks like you are using Android for the first time. Sorry I can't explain what is ADB and platform-tools, even the noobs know it. Please search for it yourself. You ought to know how something works before using it.
You can download it here:
Android SDK Platform-Tools is a component for the Android SDK.
developer.android.com
You need to turn on Developer options and USB debugging to use it (There are other cool settings in developer options, which will make your phone smoother).
You will also need to authorize USB debugging through a popup after connecting the phone to the PC with ADB.