Clarifications abt potential system

1. Example i magnified this hat
and i got rare and had 2 lines
no matter how much i cube it, it wont go to 3 lines? But it can go to unique/epic?

2.What u mean by
rare primary
rare primary epic secondary
epic primary
epic primary unique secondary
unique primary
??? Wad de meaning
i thot there was only rare epic n unique?
Blue purple yellow
the above is the thread abt All Potential system bonuses thread in the training center

ok lemme get this strAight
if a item has 3 lines
the top is called primary and the bottom 2 is secondary?
And so the bonuses of epic primary is the same as unique secondary?
Isit possible to have a chaos zak helm dat goes
Str 9%
str 9%
str 9%?

3. Ok this might sound lulz but can u potential pet eqs
srsly ?

Thx for the replies