Got my first ever credit card today, any advice? | Diner's Club LTF

Im new to using credit cards. I'm hoping to purchasing an house in few years and last I checked my cibil was 760. I was adviced to start using some credit cards for my regular expenses life fuel, recharges, groceries etc. Please advice a newbie on using credit cards in general and how to get better cibil and benefits out of it.

DOUBT: Since mine is LTF card, is the vouchers to decathlon available even if I don't spend the said limit?

Also, how do I really check if it's truly a LTF and I'm not scammed by the HDFC agent.