The movie can be a little dated, and it has a fairly different tone from the sequel series. It's arguably not the greatest introduction to the franchise, but it does set the stage with the premise.

Once you get into the sg-1 series, it gets closer to the Deep Space 9 formula. Episodic, but there's long running story arcs for each season.

I liked it a lot because it was a more modern setting for the sci fi, which was a fun way to tell the story. Like Star Trek, it's very much the ensemble that makes it work well.

Some people didn't enjoy when there were cast changes, particularly Richard Dean Anderson's departure in season 9. He is certainly missed, but I thought they did a good job creating a similar tone without making a carbon copy of his character.

Atlantis was also quite good. Universe was a very strong tonal shift, and the transition wasn't easy for fans at the time, but I think the show benefits from binge watching. Sadly, it feels like just as it finds it's footing in season 2, it gets cancelled instead

I recommend first watching the feature film, starring Kurt Russell and James Spader, then SG-1, then the two SG-1 movies, then Atlantis, then Universe.

Elevator pitch: the ancient Egyptians were enslaved by a race of alien beings who ruled by posing as gods with their advanced technology. The pyramids were their landing pads. The Egyptians eventually revolted and the aliens fled in ships, leaving the Egyptians to bury the Stargate, which is an advanced portal that lets people cross instantly between worlds through a wormhole. In modern times, a dig discovers this Stargate and the American military, with the help of an archaeologist disgraced for his theories about ancient Egypt, figure out how to use it to travel to other worlds themselves.

Stargate the movie is the start point.

Stargate SG1 is the main series with a spinoff series called Stargate Atlantis co airing from season 8 onwards and extends 2 years after SG1 ends. After the end of SG1 there are 2 films one to wrap up SG1 and the other fun wibbly wobbly time fuckery one. Then some time after (I am not sure how long) Stargate Universe takes place.

The shows premise is the US Air Force trying to not manifest destiny across the galaxy but end up pissing off the feudal snake headed "gods" of the galaxy and support an uprising of the warrior cast against the gods

The first season is a bit weird but genuinely gets better as the actors get more comfortable with their characters.

SG-1 is great and I think you will be in for a good time, in my opinion though you can skip seasons 9 and 10. I think they just pushed it too far past it's prime.

There's a bit of cringe acting in the very beginning and some of the overarching stories might need a bit to form but it quickly moves past that. I think Stargate is generally great if you're into space exploration, particularly the planets & civilizations type of stuff of course, and there's some great story arcs. It also got some great characters in the various seasons. Only thing I'd ignore is Stargate Universe. Always felt like some teen soap opera / drama.