LogFAQs > #978718214

To elaborate/clarify more on the Gundam franchise: There's the main "Universal Century" timeline that starts all the way back with the original Mobile Suit Gundam anime and should be followed in order, and then there are several "Alternate Universe" Gundam anime that aren't connected to the UC timeline at all and can be watched as standalone stories, such as Gundam Wing, G Gundam, Gundam Seed, and the most recent Witch From Mercury. Considering the heavy time investment needed to watch the UC timeline and how old and dated some of it is, I would recommend any franchise newcomers start by picking out one or two of the AU series. Then if you like those enough that you get curious about the UC timeline, you can consider jumping into that later on.

More info, including a watch order of the UC timeline if you dare undertake it, can be found here:

https://www.reddit.com/r/anime/wiki/watch_order/#wiki_gundam