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Hi Sandeep! Looking at your post history, it seems like you are getting started with Salesforce and looking for training resources. Our forums are best for getting assistance with specific issues - not general questions like these. You should check out Trailhead and start earning some badges! https://developer.salesforce.com/trailheadYou'll find answers to all your questions by working through the modules, and this is the very best way to learn Salesforce.