Always remember that heavy items are recommended to go to the back and at the bottom.
You don’t want to end up placing a heavy box on top of a box that has fragile items in it, that won’t end good.
Labeling what is in the boxes can help this to not happen, then you aren’t guessing what is in each box you are storing. Also, be sure to properly wrap items vs just packing them in a box.
Taking just a little extra time to plan out where things will go can help a tragedy and much frustration be avoided.