Consider your intended use(s). For example, if you are mostly going to use it in a studio/indoor type setting, then you probably aren't concerned about weight. But if you plan to take it hiking, then you'll probably want something lighter.
How heavy is the gear that you'll put onto it? Will you be using long telephoto lenses?
How tall are you and do you want/need a tripod that will be comfortable to use in a standing position?
How much precision do you need? Will you be shooting macro, or maybe multiple shots to stitch into a pano?
How demanding are you going to be for the very best image quality? Professional landscape photographers are likely to use tripods that cost $600-$1000 and then a head & accessories that cost another $700.
Most 'good' tripods will be separate from the head. The head is a more personal choice than the 'legs'. Common types are ball, 3-way, pan & tilt, gimbal, geared, pistol grip ball etc.
And something I've heard said of choosing a tripod....there are three main factors....
1. Light weight (doesn't weight a ton)
2. Is strong, stable and robust
3. Doesn't cost an arm and a leg.
The catch is, you can only pick two of the three options.