How can I check the platform number for my train?

I’m traveling on an Indian Railway train and want to know how to find the platform number for my train. Is there a simple way to check which platform my train will arrive or depart from? Can I find this information online, or do I need to ask someone at the station? Also, are there specific apps or websites that show the platform number along with other train details? I’d love a straightforward, reliable way to get this information so that I can be prepared and save time at the station.