i have looked at my Super hero history Topics, my best series, my best New 52 and Rebirth lists and this is the list of my favorite series or first arc.
For the most part, it excludes famous Graphic Novels, single issues, issues that are of historic interest, like Doom.Patrol first issue by Morissn and Origin stories
These are just the best stories I have read, for a wide range of characters and eras
01 1961 Brave and the Bold 34 Hawkman by Schwartz Fox Kubert
02 1974 Adventure Comics 431 to 440 The Spectre Superhero as horror comic Writer/Artist Mike Fleisher/Jim Aparo. Editor Joe Orlando,
(Not in Library Substitute 1992 Specte by Ostrander and Mandrake]
03 1976 All Star Comics 60 on (omits 58 59) revival of Justice Society of America. Introduces Power Girl. Conway Wood.
04 1979 Detective Comics 471 to 476 Steve Engleheart and Marshall Rogers
05 1984 All Star Squadron Set in World War II Roy Thomas
06 1984 Saga of Swamp Thing 21 The Anatomy Lesson Alan Moore
07 1993 Death High Cost of Living The Trade includes Death’s First Appearance in Sandman 8, 1991, Sound of Her Wings Neil Gaiman
Not in library, available at Comixology or try Library or buy Graphic Novel trade
08 1996 Supergirl 75 to 80 Peter David
Linda Danvers Supergirl meets Silver Age Kara el Supergirl
09 1997 JLA Big Seven return.with epic plots. Grant Morrison.
10 2000 Planetary Warren Ellis John Cassidy
11 2002 Global Frequency Mature Adult Mission Impossible type stories with mostly new characters each issue Warren Ellis
12 2003 Teen Titans Young Justice mentored by New Teen Titans Geoff Johns
13 2004 DC: The New Frontier by Darwyn Cooke. Set in late 50s early 60s.
14 2011 Aquaman Geoff Johns
15 2011 Demon Knights Set in Medieval Times. Paul Cornell
16 2011 Frankenstein Agent of
S.H.A.D.E, Jeff Lemire.
17 2011 Huntress mini (Helena Wayne)
followed in 2012 Worlds Finest with Power Girl Paul Levitz
18 2013 Earth 2 17 on.Tom Taylor
19 2015 Superman Lois and Clark Introduction of Jon Kent, their son. Dan Jurgens followed by Superman Rebirth in 2016, followed by Super Sons.
20 2015 Titans Hunt 1960s Original Teen Titans Dan Abnett followed by DC Universe Rebirth 1 then Titans Rebirth 2016
21 DC Universe Rebirth 1
22 2016 Wonder Woman Year One. Issues 2 4 6 8 10 12 14 Rucka Scott
23 2016 Detective Comics Rebirth Tynion IV
24 2016 Green Lanterns Rebrth Sam Humpries
25 2016 Flinstones Mark Russell
26 2018 Justice League Dark Tynion
27 2018 Hawkman Robert Venditti
28 2018 Justixe League Odyssey issue 6 on.Dan Abnett
if you want to learn significant events in super hero genre history