I've been trying to get back into comics, and am interested in collecting Superman single issues.
I am familiar with the "Triangle numbering" period of Superman, where the stories between Superman, Action Comics, Man of Steel, Adventures of Superman, etc. were linked and the triangle numbering helped determining the read order.
However I have picked up some issues of both Superman and Adventures of Superman after the Byrne "Man of Steel" mini series but before the triangle numbering kicked in.
Are the stories linked between issues?
If so is there an easy way to find out how should these be ordered?
I am also interested in the post-triangle numbering issues and have observed stories that continue between Action Comics and Superman (such as "Up, Up and Away" from 2006)
Is there also continuity between Superman and Action Comics from the New 52 and Rebirth era, or are there only certain stories that cross over?