Here are some of the films within the Star Trek universe and some things to be aware of when considering watching them. For each, I'll provide a brief overview, some of the characters and cast, and a link to the IMDb page.
In general, I think that one should watch some episodes from the various TV series first since they provide a better idea of what this franchise is all about. Most of the films lean much more heavily on being action movies and often involve higher stakes and evil villains.
1979
The first film, which featured the cast of the original series.
Admiral James T. Kirk (William Shatner)
Spock (Leonard Nimoy)
Dr. Leonard "Bones" McCoy (DeForest Kelley)
Montgomery "Scotty" Scott (James Doohan)
Nyota Uhura (Nichelle Nichols)
Hikaru Sulu (George Takei)
Pavel Chekov (Walter Koenig)
Christine Chapel (Majel Barrett)
1982
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1984
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1986
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Also known as, "the one with the whales."
1989
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1991
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1994
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1996
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1998
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2002
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2009
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2013
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2016
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2025
The general consensus from audiences: it's an absolute disaster and a disgrace to the franchise. I refuse to watch it and don't recommend anyone to watch it, either.