Welcome to Flyertalk.

The search funtion here is very friendly, just go to the respective forum you are interested in and type in a search for that specific topic. I.e go to the Delta forum and type in "bonus miles" or "offers" or "milage earning card" ...etc....Repeat for next airline in that forum.

Altrenatively just go to the specific forum and scan a lot of past threads, clicking on ones that interest you. You will soon pick up a lot of very useful tips.

Flyertalk is set up pretty well with the individual forums so there is no one single forum to discuss the different programs you mention.

Cheers
J