Nuts to that let's go balls deep and terraform the sun.

If we stopped terraforming Earth to become unlivable, we wouldn't need to terraform another planet at all for a while.

Makes sense if what you're talking about is a pressurized bubble, but that seems like a misuse of the term "terraform", imo does not count unless people can live outdoors. Mars has the radiation problem but you could fudge a solution to that with genetic engineering, the moon can't hold an atmosphere so it's impossible.

Neither one has a strong enough magnetic field to protect us (or life similar to us) from the levels of solar radiation harmful to life. In my opinion, we'd be better served looking to inhabit one of the Jovian moons. As several others have already suggested, how about terraforming Earth for a change?

This article is more about where is more convenient to make a first off world base than terraform. It's very hard to make a base on mars and the moon but a moon base is much easier.

Terraforming is a whole another beast though. You'll need to be able to create industry on Mars with local resources to begin terraforming, notably harvesting solar energy. Wind energy is going to be absolute ass to begin with since the air pressure on the moon in 1% of earth's so we'd need to do a stupid amount of climate change just to make it as livable as Mount Everest Basecamp. Probably we'd need to electrolyze all of the surface rust for oxygen and then we'd still need to deal with radiation issues because of it's still missing the molten core.

More realistically we'd need a Dyson sphere around Mars, a shaft that goes all the way to the core and blast it with the power of the sun for centuries to kickstart the core again. Not sure about the calculations on that one. Could off by many factors of 10. Once done it can be sealed and the insulation will keep it going for a longer than we'd have to worry about.

I personally think a floating city on Venus a lot nicer. At 50-60km elevation the air in breathable for humans so we'd just have to make massive blimps.

Let's get a handle on keeping Earth sustainable first yeah?

Lunar regolith is razor sharp asbestos.