Ballistics magazine has recently published some nice basic info articles. They call them "Shooting 101".
Most recent to the beginning:
Shotgun loading
Understanding ammunition
Sight in a Riflescope
Parts of guns
How to mount a rifle scope on a bolt-action
Second Amendment rights
Firearms Actions
Info for new/prospective gun owners
More Shotguns for home defense
And, beyond Ballistics, other pubs have useful basic info
Most recent to the beginning:
Shotgun loading
Understanding ammunition
Sight in a Riflescope
Parts of guns
How to mount a rifle scope on a bolt-action
Second Amendment rights
Firearms Actions
Info for new/prospective gun owners
More Shotguns for home defense
And, beyond Ballistics, other pubs have useful basic info