In this world it will show a template on how to create a an item with an Attribute Modifier.
This map includes:
A item template
and
A command block template

Here is a example on how to input the command.
/give @p 301 1 0 {AttributeModifiers:[{Name:"generic.maxHealth",Name:"generic.maxHealth",Amount:500,Operation:0,UUIDLeast:8000,UUIDMost:4000}],display:{Name:The Max Boots}}

Additional Notes

This is one of the most complicated things I tried to do.
I had to download a pre-made template and actually explore it using nbt explorer.