After the update I went into passwords and they were all gone

After the update I went into passwords and they were all gone I have another Mac it is a MacBook Air This one is a MacBook Pro with no passwords. Everything I put in pictures winds up on both same with ITUNES I sighned in and out of ICLOUD Since all the passwords are the same sites same passwords and when I put in a new password on one it goes to both is there a way to transfer from one to the other ?

[Re-Titled by Moderator]