Looking for cheap easy way to get more bass in my car.

Hey guys! I’ve always wanted to add a subwoofer to my car and what better time than right now going through a mid life crisis. I’m looking for something cheap and easy that I can install myself, but no idea about any of this or what to even get. I was thinking about some kind of micro subwoofer but again, not even sure what I’m looking at. Any recommendations would be appreciated!