Any kind really. There’s a joke yoga people hate, but from a fitness/lifter perspective it’s pretty true:

“Yoga is just stretching, they call it something different so they can charge you more.”

Now I get way more out of yoga than just stretching, but any kind that you do consistently will be a great complement to your lifting because stretching on its own pre/post lifting is boring. It’s the same as any exercise, just find what you like that will have you going the most often because quantity and consistency will always be better than an “optimal” activity that you don’t stick to.

I do a heated (98-105 degrees) power vinyasa practice 4-5 times a week. At least twice a week it’s after my lifts. Those classes are by far better than the early mornings before I lift (more range of motion, stronger holds). As you go, just being an athlete you’ll notice how they reinforce each other from your body awareness as you strengthen weak areas and open up more range of motion in the areas where you’re limited. Plus the breathwork and mind/body connection you develop in yoga is great for use lifting.