I ran home from school.
(It happened in the past, but you might do it again tomorrow, who knows?)
I would run home from school every day.
(You used to run home from school every day, but the 'would' implies you don't anymore. Maybe you're not in school anymore?)
I would run home from school once a year.
(Same as above. You ran home from school once a year, but the 'would' implies that you won't anymore.)
Does that make sense?