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Slot Compatibility

Items can only be equipped in compatible slots: 
// In ItemDataAsset
Equipment Slot Tag: Equipment.Slot.MainHand
Compatible Slot Tags: [Equipment.Slot.MainHand, Equipment.Slot.OffHand]
This sword can go in either Main Hand or Off Hand.

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Validation Methods

Can Equip Item 
bool bCanEquip = EquipmentComponent->CanEquipItemInSlot(ItemInstance, SlotIndex);
if (!bCanEquip)
{
    ShowNotification("Cannot equip this item here");
}
Find Valid Slots 
TArray<int32> ValidSlots = EquipmentComponent->FindValidSlotsForItem(ItemInstance);
if (ValidSlots.Num() == 0)
{
    ShowNotification("No valid equipment slots for this item");
}
else
{
    // Equip to first valid slot
    EquipmentComponent->EquipItemToSlot(ItemInstance, ValidSlots[0]);
}
Find Slot By Tag 
int32 SlotIndex = EquipmentComponent->FindSlotIndexByTag(
    FGameplayTag::RequestGameplayTag("Equipment.Slot.Head")
);

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Two-Handed Weapon Example

For two-handed weapons that occupy both hand slots: ItemDataAsset: 
Equipment Type Tag: Equipment.Type.TwoHanded
Equipment Slot Tag: Equipment.Slot.MainHand
Compatible Slot Tags: [Equipment.Slot.MainHand]
Custom Logic (in your equipment component Blueprint): 
Event On Item Equipped
   ↓
   [Is Equipment Type TwoHanded?]
      Yes → [Unequip OffHand Slot]
      No → Continue