Look for options that have smooth tilting heads and lockable moving parts that are made out of good quality materials — you'll lessen the risk of camera shake by doing so.
There are lots of additional things you can buy to assist you in your astrophotography journey, but a tripod is probably the only real essential of getting going straight away. You won't be able to hold the camera still enough for the shutter speeds required to capture the darkness of the night, using one of the best tripods for night sky photos is a must. Look for options that have smooth tilting heads and lockable moving parts that are made out of good quality materials — you'll lessen the risk of camera shake by doing so.