It has been a while since i have sent a post, so today i will teach you guys how to code your very own OP Sword using command blocks.

First, you will need to pick what sword type you want, to do that, what you need to do is:
/give (@p/@a/@r) (diamond/iron/wooden/golden/stone)_(axe/sword) (amount) 0

Then, you pick the enchantments that you want to have with your sword. The different enchantments you could have are:
Sharpness:16
Smite:17
Bane Of Arthropods:18
Knockback: 19
Fire Aspect: 20
Looting: 21

...and how that would go into a command is:
/give [" "] [" "]_[" "] 1 0 {ench:[{id:(16/17/18/19/20/21/34/70),lvl:(1-1000)}]}

And lastly, do trial and error, see what is hot, and what is not, and then brag to your friends that you can create completely OP swords. One of my favorite commands are:
/give @a diamind_axe 10 0 {ench:[{id:16,lvl:1000}],[{id:17,lvl:1000}],[{id:18,lvl:1000}],[{id:19,lvl:1000}],[{id:20,lvl:1000}],[{id:21,lvl:1000}],[{id:34,lvl:1000}],[{id:70,lvl:1000}]}

Pls note that this may not work in 1.10 (but might) since this is a 1.9 command. Pls alert me in the comments if it does or doesn't work. :D