@Sathishbs - all I can tell you is to read read read. Start with getting started on the home assistant home page.
a binary_sensor is an on/off type of sensor. something that has only two states - hence the name ‘binary’ (open/closed, on/off, motion/no_motion, etc.). A device_tracker is exactly what it sounds like an entity in home assistant the tracks a device. A common one is to install the Home Assistant app on your phone, which will create a device_tracker that represents your phone. Through that, you can make an automation the does things when you arrive somewhere, leave somewhere, etc.