Choose a degree that appeals to you, where you will learn what you like, instead of one which acts as a stepping stone for a higher paying job? Even in countries with sane tuition prices (read: not the US) plenty of people will blame you, and that decision in particular, for any financial problem for all your life.
Become pregnant, and/or plan to work fewer hours for some time to take care of your kids or any older relative? How brave of you. Here's your prize in the form of reduced pay for the next 10 years or so.
Decline that managing position because you like your current job better and you know you won't enjoy being a manager? Cue the disapproval stares from people close to you.
Stay in your job for 15 years because you like the people, the work itself or some particular perk? When you finally leave, your next job will pay less than if you had hopped around each 2 years. That's if someone wants to hire you.
Sure, every decision counts and very often there is a tradeoff between trying to find happiness and trying to find a job that sustains you. However, lately the tension between those two is so high that any small decision towards living the life you want to live may very well end in financial misery for the rest of your life. This is not hyperbole; I know people who fucked up mildly once, fifteen years ago, and are still paying the price. And I'm one of the lucky ones... I haven't fallen through the cracks. Yet.