It depends on what I'm doing. If I'm reading/studying and trying to mostly absorb material, I usually listen to either synthwave (and related: darkwave, horrowave, retrowave, whatever you want to call it), or classical.
If I'm writing code or doing something active like that, the above applies, but add heavy metal to the list of things I might be listening to. But if I'm listening to metal it's almost always only bands and songs that I'm extremely familiar with (eg, have listened to a given song hundreds or thousands of times in my life) as those are less likely to be distracting to me, as opposed to something new where I feel obligated to really pay attention to the music.
One other option is I will sometimes put on a movie that I've watched many, many, many times (eg, The Matrix, Hackers, Antitrust, Tron:Legacy, The Social Network, Rad, Vision Quest, etc) minimize the viewer window and just have the audio in my headphones.
Very rarely I might go with some sort of basically "white noise" track like
"Howling snowstorm and crackling fire" https://www.youtube.com/watch?v=volQGswo3dg
"Cyberpunk city sounds" https://www.youtube.com/watch?v=x5zX1eRKEDM&
"Twin Peaks Double R Diner" https://www.youtube.com/watch?v=npVellnR6D8
"Coffee shop" https://www.youtube.com/watch?v=VMAPTo7RVCo (unless I'm actually sitting in a real-life coffee shop, which I quite often am)
etc.