When I watch something where the timeline of events are different from the official release order, I make a chronological list.
What is the "Roddenberry Timeline"?
The "Roddenberry Timeline" means all Star Trek produced within the same in-universe continuity that started with Gene Roddenberry's original Star Trek series. For other Star Trek media, see my "Modern Timeline" list. For the reboot movies, see my "Kelvin Timeline" list.
(This list also includes the fan production Star Trek Continues because it is the highest quality and most period-faithful Star Trek fan series ever produced and because it fills in an important time gap between The Animated Series and The Motion Picture. This is just my personal preference, not official canon. If you disagree, you can simply skip those episodes without missing any important information. You should give them a try, though.)
Based off of The Star Trek Chronology Project's order at http://bit.ly/1LHfST4
Added Star Trek: The Animated Series, and plan on incorporating worthy Fan Fiction in future.
Star Trek Canonical Timeline
This list consists of all live action Star Trek series (except Enterprise) and movies in stardate order. It includes JJ Abrams' first Star Trek movie, as it's beginning shows repercussions from events seen in the last TNG movie.
TNG Season 1 Episodes are not listed in stardate order, as it would create continuity issues regarding Wesley Crusher's status.
Minor Star Trek II spoiler:
If TOS is viewed in stardate order, it explains why Khan recognized Chekov, as some episodes with him have stardates before Khan's first encounter with the crew of the Enterprise.
Star Trek Essentials Episode Selection
Updated in Jan. 2024
*Strange New Worlds, Lower Decks and Prodigy are in the list as a whole show.
**Discovery is in the list as seasons.
Personal TV Show Collection
Movies, shows, seasons, and episodes I plan to watch.
Star Trek: Deep Space Nine In 82.5 Hours. Credit: goo.gl/q26eK6
This lists the essential episodes recommended by Max Temkin as part of his Medium post:
https://medium.com/maxistentialism-blog/star-trek-deep-space-nine-in-82-5-hours-10acde591fd2
Star Trek Chronology Project
by Xuth