Alright lemme explain the blood/hit power/caster/safety items
Blood::These kinds of crafted items will have Life leech, Life Regeneration, And Life Addition(Used for melee characters)
Hit Power:: These kinds off items will have attributes like, 5% Chance to cast lvl 3 frost nova (e.g.) And Attacker takes damage(Used for melee characters)
Caster:: These crafted items will have affects like Mana stolen per hit, Mana regeneration, mana after each kill, And a faster cast rate(Use these for casters Ex. Sorceress, Druid, Etc
Safety:: Safety items will always have attributes like Magic/Damage Reduced By X, Random Fire, Cold, Lightning, Poison Resist, And enhanced Defense.
If my guide doesnt help go to
http://diabloii.calcon.net/crafted_items5.shtml
They explain all the types off crafted items with the attributes they have on armor, weapons, helms, Etc, Etc.