Bitcoin core wallet - got 0 balance after transaction
The second output is most likely change being returned to your wallet. Just like when you use a $5 banknote to buy a $1 item. You get $4 back in change. You don't try to tear off 1/5th of the $5 banknote.

Unspent Transaction outputs (UTXOs) can't be half spent, you spend the whole UTXO and get change back.