About the onbytes

I know there are many topics with the same thing but I just can't understand them.

I know the Off-Bytes are the highlighted ones in the Hex. (Using IDA)

And I know something about in ida, if the line of the addie is jge or jnz the first on byte is xEB , but what about the second and what's left to know? please help..

LOL Near all asm got Jnz rofl that dosn't mean its EB

^ He already told you.

Find the start byte of the current off function,jump over that and you will get the on byte
Google it, i bet you can find some good tutorials for it