There's nothing 'digital' about a tripod...so I moved your post into the 'Equipment' section.
Some say that when choosing a tripod, there are three main options...
1) Strong & Sturdy
2) Light Weight
3) Low Price
You only get to choose two of the three options.
Obviously, you want a tripod that will hold your gear. So consider the weight of your camera plus the biggest lens that you have (or plan to have).
A cheap tripod will probably do what you want, but it probably won't be the sturdiest and it may not last a long time. A good tripod, on the other hand, may last a lifetime. So consider it an investment.
If you ignore the cheapy tripods, most will have separate legs & head that are interchangeable. For the legs, consider the height and the weight. Also consider how the legs splay out (some go really wide so you can get low). Some have a centre column that can turn 90 degrees or that can be reversed completely, allowing you to get the camera low to the ground.
Aluminum is a common material for tripods...but there is also carbon fiber which is a lot lighter (but much more expensive).
Then you need to consider the head. There are many types & styles. It really comes down to personal preference, so I'd suggest going into a good camera store and getting your hands on some different ones, to see what you like.
You really can't go wrong with Manfrotto/Bogen tripods.