Is there a FAQ somewhere that explains the various types of fasteners and
terms? I am browsing around for air staplers and nailers and am perplexed
by the choices...

For example, what is the difference between a "L" nail and a "T" nail?

Some of the nailers or staplers says they can shot say so many shots per
second. I wonder when this is applicable? I would assume most carpentry
usage is one nail at a time somewhat precise where you want it? When will
you shoot so many nails or staples a second? Is this for attaching oil
painting on portrait frames?

Some staplers and nailers that can do up to 2" says the 2" depth is "FOR
SOFT WOOD ONLY". What does it mean by "soft wood". Is regular 2x4 wood
studs soft wood? I would assume so. What about pressure treated 2x4 or
2x6? Those are still considered soft wood right? I assume soft wood in
this context mean not hard wood, not oak or cherry - not to be used to nail
hard wood flooring or baseboard? or shallower depths is ok for hardwood?

Is it better to use a staple or nail to attach baseboards? If my baseboards
are to be stained and not painted?

I assume there are websites with these answers already but I searched and
couldn't find any relevant ones.

Thanks,

MC