You're clearing the bottom branches. Instead of wasting nutes on lower branches, that won't get much light, youre ensuring the main kolas and upper branches get the most bang for your buck! And you're also helping air circulation.
yea loly poping is where u cut all secondary branches so the plant can put more energy into makeing larger colas if u dont lolypop ur yeilds will be the same though so i dont do it. u just have fewer buds that are larger as oposed to haveing smaller buds but more of them. u have higher chance of getting mold with biger colas so i like to leave my plants be i never even cut 1 leaf off of my plants