Well , thanks for making me Panicking

Just checked preevs and It's like ~315$ , It will keep going down or what ? Im really not that experienced on Bitcoin economics
People are buying gifts for holidays, this is bitcoin early days... don't fret. The halving is drawing near...mid 2016.
NEVER sell for a loss.
Alright , I will calm down because you seem like someone with experience.
But could you please explain what "halving" mean exactly please ? thanks