Running a full node (Bitcoin Node) is only a way of making yourself and transactions more private, it's also an indirect way of helping the Bitcoin network to become more decentralized as mentioned above. Bitcoin is another kind of money, just like the normal fiat you don't earn it except you get a real job and get paid, so Bitcoin too. you have to work for your Bitcoin hence running a node is not working for anyone but yourself.

Pooya87 has given a perfect answer for the lightning node thing.


Hilarious   
It's really worth asking... Or should I still refer OP to learnmeabitcoin to understand how Bitcoin works.