New to sourdough !!

Hi everyone!

I am attempting to make sourdough for the first time and have some questions! I understand how to make the starter (im on day two) and the bread itself but what i am confused about it the middle part. After using the sourdough starter for the bread, how do I make sure there is enough for next time? after feeding does it go in the fridge for me to use next time? When that next time comes around, how do i feed it enough to get enough for the recipe again? thanks!!