Like others have said, loose meal planning, etc.
I recently treated myself to a food vacuum sealer... It's a game-changer! I live in the UK where we have tiny fridges and the food doesn't stay good very long (which is probably a good thing) so having something to prolong the life of fresh food is VERY helpful!
I also found a visual chart (on Pinterest, I think) with the expected 'life duration' of different fresh foods and tips to keep it fresh longer (for example, apples kept in the fridge rather than a fruit bowl are good up to three months). It really helps!
Also, making sure your fridge is not too humid, not washing fruits and vegs until you're ready to use them, etc. can help.