Welcome to "the fold."
Probably the most simple firearm is the double action revolver. There are so many I couldn't even begin to list them ... you've already been inundated with everybody else's fave-piece.
.38/.357 in a medium frame (probably 4" for a house gun or 2.5"/3" for possible concealed) would be a great first starter shooter in a revolver. And, probably what I would recommend to any beginner only because they require less maintenance than any other design. Hold a few different frame sizes (& never, ever forget The Wife in this process if she will be shooting it too!) & get one that properly fits your/her hand. It will be easier for you to shoot well a smaller frame than it will be for her to shoot one too large.
Although ...
I think the Browning Hi Power is THE most simplistic design (for all reasons) in a semi-auto handgun. It has two safeties (I can can hear the howlings now!
) one simple wipe of the safety, pull the trigger & it goes bang & the other = between your ears (as with every other firearm) .... all other "extra" safty devices are some nonsense devoted to some idea that a thinking person cannot possess a weapon without some sort of extra safety-stuff added. I can't wait for a smart gun to come equipped with an airbag.
&
If you will perform the most basic cleaning & safety measures, I would go with the Hi Power. A very shootable handgun that has every thing you'd ever want with zero bells & whistles.
If you won't perform the cleaning, etc. to ensure proper function of any firearm, I'd go with the double action .38/.357 revolver.
If you won't perform any safety measures yourself & would rely on some built-in safety measures of the firearm's design - I'd go with a big stick because you aren't responsible enough to own a firearm.
No flame - the truth.
The FBI's been issued so many different stuff for so many different reasons, I'd hesitate to even begin & really, who cares what the FBI has?
Go with what works & the (some) good folks here have more expertise than does the FBI anyway. We're the gun-nuts, they just enforce the law.
... many
s
.38/.357 (shoots both power bullets) is pretty nifty because you can shoot way cheap w/low recoil for practice (.38 special) & too, have the ability to have a much more powerful firearm for home defense (.357 magnum). If you get the revolver that shoots .357 magnun, it will also shoot .38 special "bullets" (cartridges - we'll leave all the crazy nomeclature for the future).
The Hi Power shoots 9mm bullets (same as .38 special, for all practical purposes) & is perfectly adequate for target & home defense.
9mm is available in a wide assortment of "power factors" which are from light loads (for target) to more "forceful" ones (for home defense).
Either way, attempt to try out several so that you are comfortable with & what you (& The Wife) can shoot best (may take a while) .... it'll be worth it in the long run.
Any handgun is under-powered to "stop a man cold in his tracks." More later ...
Personally, I'd not go below .38 special/9mm in power factor or above .45 ACP for the general "all-round" handgun. They'll all do the trick, assuming proper bullet & placement.
Do let us know & good luck & good shooting AND be safe.