well a full blown co2 setup would be... but ive seen people use dry ice, and the yeast sugar method... like others have said... its better than nothing... and that yeast sugar methods dirt cheap
FIMing, stands for fuck I missed lol... but its where you cut just the beginning of the top of the plant... you'll need to look it up to get a good pic of it... but its like topping kinda except when you cut 80% or so of that top shoot your ultimately cutting both of the nodes and both of the fan leaves... so when its done right it becomes 4 branches... altleast thats the impression that ive gotten from reading, havent done it yet. theres a few articles on it...
Scrog... is a screen of green, it involves placing a screen over your plant and then weaving your branches into the screen so that it creates a canopy its the same theory behind tying the plant but it allows for an even canopy where the whole plant is getting an even amount of light... and when it keeps growing you just keep pushing it under the next section of the screen, and then you flower when your ready... provides even coverage for multiple hearty budsites.