You can buy Litecoin from various exchanges like Binance, Bittrex, CoinSwich, Cryptopia, OKEx, and more.
When it comes to
litecoin mining, it uses Scrypt algorithm as its proof-of-work model when mining, whereas Bitcoin uses SHA-256.
Also, it takes less time to mine LTC (2.5 minutes, compared to BTC's 10 minutes).
In my opinion, this is easier than bitcoin mining.