LST is short for Low Stress training.. It is a technique used to allow for longer vegetation periods, while at the same time training your plants (bending them) so that they remain low to the grown. There is a fairly good section in the FAQ at the top right of the page...
Dwarf strains are great for SOG (Sea of Green). It is the theory that many small plants produce the same if not more buds that a few really big ones. Examples ar Low Rider, Auto AK47's and such... They produce decent buds, in small spaces wil rapid yeilds... espacially after some experience in rotating crops...
Cheers, and have a good weekend..