I'll start first: Facebook Ads. We've realized it's simply too early to advertise there (most SaaS companies were optimizing for 12-20 months return on investment, so they could allow to spend much more to acquire a customer). What about you?
Habit forming is a bit of a buzzword these days I feel but the value is quite obvious when forming good habits. The main ones I have formed are reading every day and drinking 2l every day, easily done as the benefits are obvious, what are some you have formed?