There are a number of different star trackers out there, and the choices can be overwhelming to a beginner! Currently, the Sky-Watcher Star Adventurer 2i Pro and the iOptron SkyGuider Pro are both excellent options for most skill levels and budgets. They are both very similar, with payload capacities of 11 lbs (5.5 for imaging), connect to your phone via WiFi for control with an app, and use electronically-driven motors to track the Earth's rotation.
If both of those are out of your budget, there are less expensive options, such as the purely mechanical Omegon LX2. This particular model has a much lighter payload capacity, so it can only hold a DSLR or Mirrorless camera and a camera lens — the lighter, the better. But it's also the most portable star tracker option as well.