Chess tactics explained with a game

I am @kartiks2013
https://lichess.org/8SuN88g1HQT4
https://lichess.org/J4dzZwqmoV1w
In the first game castling is a good move because if the bishop takes our bishop then we take the queen and they can't take it back due to mate.
In the second game we forked the queen and knight at the last winning us a piece.
See these games too.
https://lichess.org/3wVlRWez/black
https://lichess.org/5ddnLUr3ThJP
https://lichess.org/zIJymg09OlWs
https://lichess.org/jftwcJFSwT7C
Play Evgenij-031 • lichess.org
https://lichess.org/aSLWSfCz/white#0
https://lichess.org/W8B71P2I/black#0
https://lichess.org/Lp7OnGNu/white#0
https://lichess.org/ngXCTa2q/white#0