Tip - How Can I Turn Vague Goals Into Actionable To-Dos?

I've got the hang of keeping my daily to-do list actionable, but I'm struggling to include some of my large and vague goals. How would I go about creating actionable items for a to-do list from a list of non-concrete goals, like ideas or self-improvement concepts?
Tags: Ask Lifehacker, Goals, To-Dos, Productivity, Habits, Achievements, Planning, Life Planning, Top, Lifehacker