Just took the plunge and am wondering what tips/tricks do you have for keeping produce on hand without it spoiling before you can get to eating it?

So I recently started and have been struggling to figure out the right amount of veggies to get without them going bad before I get to eating them. Are there any preservation tips or buying strategies you guys have used to prevent this? Also any other tips other than just plain preservation are welcome too since I am pretty new to this way of eating.