I do whatever. When I was a kid my mom had a lot of rentals and I was always working on them. Then working with her handyman I learned a lot. I bought a couple of my own and used to flip houses.
I used to have a contractors license and had 8 mexicans doing sheetrock for me. I worked for a commercial general contractor here in seattle and picked up all the mexicans for side work. I actually enjoyed taping/mudding, smoke a bowl, crank the music and just smooth shit out, very relaxing. Hanging and sanding sucks dick though.
I also do plumbing, electric, and carpentry. Used to do a lot of woodworking. It's rewarding to be able to build things, and sheetrock is actually rewarding when you cover up some nasty shit with a nice clean smooth surface.
I've ran my share of sewer augers fishing out condoms and tampons and even grocery bags from angry tenants who were evicted, one faggot put marbles in a condom and stuffed it down the sink past the trap. Also have layed carpet and replaced dozens of windows. Did the tile in my bathroom, refinished my attic (built staircase, drywalled, new floor, new electric)
Flipping houses I used to go to lowes contractor store, where you could order double hung double paned windows custom made to your dimensions for around $140 each. I would go through the house, rip out all the existing windows and trim on the inside, take the measurement, order the windows, then just plop 20 new windows in, shim them and slap some trim on the inside. It took a day to rip out and a day to install with me and a skilled handyman, and added an easy $10k+ above cost to the value of the house. Siding was another good one, go right over some nasty shit and it looks like new for a while.