Knife nut?
I started this rambling thread asking about the SKS. I have some guns: a couple of handguns, and a few .22 rifles, one bolt-action larger caliber rifle, and er.... a "few" shotguns.
Sure, the SKS would be a great first gun: it is inexpensive, durable, parts are available, ammunition for target practice is astonishingly inexpensive, hunting ammunition is fairly-priced, and it requires little, but regular, maintenance.
But...as Semper Fi said, what do you want it for? It has little hunting utility for anything other than deer, realistically speaking. It is "approximately" accurate, so for target shooting a tight group would be 3-5 inches. It is comparatively heavy for plinking in the woods (up to 8 pounds or so), it is not built for long-distance shooting (over 150 yards), and, aesthetically, it is an eyesore.
It was built to be a durable, man-shooting weapon which could be produced quickly and cheaply. But for home defense...it is really too much gun, at least in the city. If you live in the country, maybe it is the perfect "truck" gun because it doesn't know how to break if you do simple maintenance.
If you are interesting in learning shooting techniques, there is no better caliber than a .22 in my opinion. You can learn on any type of gun, and develop good skills right away, rather than having to un-learn bad habits
acquired with a larger caliber.
OK, lots of folks say start with a larger caliber. Fine. Back when I trained folks, I started with the basics of the cartidge, and then moved up to single shot .22 rifles, then a .22 pistol, then a .410 shotgun, then a .22 pistol, THEN a .38 pistol, then a .22 pistol, then a .20 guage shotgun, etc.....
Mostly, I worked on gun familiarity, thinking, safety and safe operations, thinking, how the shell worked, thinking, and then breathing, sight picture, breathing, sight picture.
One could do all of this with the SKS 7.62x39, but using the smaller caliber to start took out a lot of intimidation.
But that was just MY way; other, more expert instructors, or those with less time per student, or no outdoor facilities use different methods.
So...FINALLY...concise response: Sure it could be, but I'd go other ways.
Be well and safe.