In the image just below you can see a simple summary of the bonuses or damage reductions. Each column shows how much damage the item in the top row (yellow row) does to the rest of the items. Any type not listed in that column means it deals 100% damage, with no bonus or reduction.
This is the meaning of the multipliers on each row:
Tip: When entering battle, we recommend rotating your device horizontally for a better gaming experience.