The basics about the damage, the damage level is high headshot level is high and range is high.
Other basics, the growth level is very slow also the clip is 4 shots and when you take out the carrocket launcher you are the the slowest farmer on the field, and the holstering speed is fast.

You probably skipped the basics read them there pretty useful but lets just get to it. The first strategy is rocket jumping if your new to rocket jumping and you tried but failed its that you jump and launch down you probably launched and jumped launched no first jump. How would you use rocket jumping? If you were in a situation where there would be a sniperagus sniper jump and launch at them, it has a 4 shot clip so be careful how you use your shots. Another way to use rocket jumping is to get onto a building or easily get easily across the map. More Strategies do too, another strat is using the slow projectile speed and splash damage to aim direct hits which do max damage.

Be aware the growth speed is very slow so if your not in a urgent situation don't pick it up.