Cut cucumber into slices or spears (whatever pickled form you'd like them in) and place them in a glass container (preferably one that they fill nicely)
Slice 1/4 a red onion and mince 1 garlic clove and add both to the glass container
Now add the fresh dill to the glass container
In a separate bowl combine 1 part raw apple cider vinegar to 3 parts distilled water (so 1/4 cup vinegar to 3/4 cup water) and stir in the salt
Pour the water/vinegar/salt mixture into the glass container and seal with an airtight container
Let the pickles sit for at least 2 hours (or until they are to your desired strength) and enjoy!
You may adjust the raw apple cider vinegar to distilled water ratio if you desire. I personally prefer a stronger pickle and typically do a 1:1 ratio of vinegar and water. Feel free to play around with the ratio until you find your desired strength!