I've worked electrician,plumber and HVAC trades. Electrician paid the best and is the one I finally retired from. Here is a tip, don't just learn one. The last job I had was top civilian electrician at a military base, after working there a while I was chatting with the boss and he asked if I knew why I got the job. I told him no. He said others had the same qualifications as electricians as I had but no else had a EPA Universal Refrigerant certification. The base HVAC tech had just quit and they hired me to cover two jobs till they could hire another HVAC tech.
there's that "certification" deal showing up again.
worked with a dude that got grandfathered into a general contractor license back in the day.
few of those grandfathered licenses/certifications left.
they can add considerable value.
