The Best Audience Targeting Techniques

I've noticed there's always a synergy between Facebook's latest ad like mechanism or like ad unit or like latest feature. What would you say are the best audience targeting techniques and I really want to delve into this because I know you don't subscribe to a one size fits allYeah definitely I've picked up on a few kind of rumblings on the jungle telegraph that yeah keep it broad just keep it broad but I know you've got different pairs he says.