First of all a warm welcome to the forums
Well, when you dan read "increased dam by ..." then this means that weapon has a Enchantment . There're 10 diffent levels of increaded dam (from 1 to 10, 10 gives +100 dam)
You can disenchant each enchantment to learn it's Formula and put that enchantment on another favorite weapon .
But also for Armor & Yewellery excist different kind of enchamtments
Take a visit to all traders and look at all the gear and compare them ... you will discover many things you probably didn't know at the moment
Have you met 'Dreavan' ? If you do, he can (dis)enchant all kind of gear. But you can only use enchantments via learning the Formula's by :
1) disenchanting enchanted gear
2) buy a Formula
3) find a Formula
It's handy to keep a list of all the learned Enchantments
Good luck and I wish you big fun with this great awesome rpg !!