How do I buy Litecoin?
Coinbase is the best and easiest way to buy it
this if you are on USA, depending on you county there may be better options.
but basically you can join an exchange or purchased directly from other users, the first option bring the safes
METHOD 1: You can buy LTC from any of the exchanges dealing with fiat to crypto in your geographical area since I do not know your geographical area I can not recommend you any.
METHOD 2: You can buy BTC from any exchange providing service in your geographical area.
METHOD 4 : You can exchange BTC to LTC from Binance
If you were unable to find out, yourself, how to buy litecoin it makes me wonder why you want to buy it and it makes sense to buy it in your case.