I find blunts to be more wasteful than pipes. You can half pack a bowl much easier than half smoking a blunt.
Keefer/keef/keif is trichomes on weed(the shiny crystals) which can be compressed into hashish. That's the good stuff. Some weed grinders have "keif" catches, which is the delicious shiny weed powder at the bottom of the grinder(beneath the mesh screens).
Chronic in states where weed is legal is usually a step below "name-brand" such as kush, Sour Diesel, Northern Lights, etc. But where I'm from chronic can be anything just some smoke worthy smoke. Kush is actually a genetic of cannabis it's not quite a strain that I know of atleast anymore. There are many kinds, ex: hindu kush, purple kush, OG kush, etc.
There's a whole section of the forum dedicated to cooking with weed. Check it out!
enjoy!