New PNB Bank Debit Card need info if anyone is PNB customer

So Today I received my new PNB Bank Debit Card that has around 10,000 rupees in it . So I read the manual with the card and it says only 5 transactions are free per month with PNB atms . So what does this mean ? Also behind the spot where Debit Card is attached it says this Card is disabled for online purchases, contactless payments. I need a card that helps me with online payments says I like to shop stuff online . And what are ways to activate PNB one app where I can see all transaction of my account? And what is RuPay if anyone knows ? Also card says it is Debit and Prepaid Card . PS : I am asking all this as I am new here in India from Germany 🇩🇪 and want to get correct information. Please help me with it . Namaste Friends .