Go to any of the previously posted links ,or many of the chainsaw manufacturer's web sites and download a few manuals or as many manuals of any saw you wish ,
RTFM ,learn them ,remember them ,and keep them in the back of your mind ,lots of good info on chain saw use and safety in those manuals because they are probably written by lawyers ,read ,remember and be aware of bad habits and keep them in the back of your mind when experienced guys(who hate to be corrected) show you the ropes because the combination of inexperience and unsafe habits will get you hurt .
So
RTFM,RTFM,RTFM , listen to what the guys say and always be
AWARE of your surroundings ......
ULTIMATELY YOU ARE RESPONSIBLE FOR YOUR SAFETY when you are in the woods and learn to say
NO when you are not comfortable in taking on a task you are not comfortable in doing because there is no shame in that (maybe a little ribbing from your peers but you won't lose a finger over it ).
Welcome aboard and we look forward to read your posts on you newfound ,honorable profession (someone had to cut the wood for Noah) and we like lots of pictures .
Can't say it enough
RTFM