shia and sunni need to talk with respect and understand each other and accept each other even with different views.
we have common enemies.
ENEMY OF MY ENEMY IS MY FRIEND
if Wahhabism leave shia and sunni alone they are fiends and have no problem.
the only problem is wahhabism.
The major difference, however, is between Wahabis/Salafists and both Sunnis and Shias. Wahabis/Salafists are the ones who comprise Al-Qaeda members, found mostly around Saudi Arabia, Pakistan, Afghanistan and elsewhere. they are pretty much, the Muslim version of the Evangelical church; only, if they're not kept under control, they can get dangerous. Salafists are the ones who are sniper-shooting Syrians and doing suicide-bombings around Syria and Iraq.
Prophet Muhammad (PBUH) has two famous sayings about truth:
1) *** the Judaism nation after Moses (PBUH) became 71 sect that 70 of them are in Hell and 1 in Heaven and Christianity nation after Jesus (PBUH) became 72 sect that 71 of them are in Hell and 1 in Heaven and Islam nation after prophet become 73 sect that 72 of them are in Hell and 1 in Heaven. ***
2) *** Truth is with Ali and Ali is with Truth ***
[en.sahih] O Messenger, announce that which has been revealed to you from your Lord, and if you do not, then you have not conveyed His message. And Allah will protect you from the people. Indeed, Allah does not guide the disbelieving people. [5:67]
[en.sahih] And We have revealed to you, [O Muhammad], the Book in truth,
... Had Allah willed, He would have made you one nation [united in religion], but [He intended] to test you in what He has given you; so race to [all that is] good. To Allah is your return all together, and He will [then] inform you concerning that over which you used to differ. [5:48]
no need to know all the sects.
only know and follow Ali (sa)
(here is text limit, please read rest here:)