Sp, or
Skill
Points are needed to learn skills for your char. When you kill a creature, you get Exp and Sp Exp.
400 Sp Exp = 1 Skill point.
For example:
the sp here is 1295 points (from 518000 sp exp)
Sp farming is what players do to maximize the amount of Skill points they gain when killing a creature. You can do this by making a level gap.
Level gap = Your charachter level - your highest mastery level.
For example if your character was level 16, and the highest mastery is pacheon (bow weapon skill tree) was level 7, then your charachter has a:
Level gap = lvl 16 - lvl 7 = 9 gap
The larger the level gap, the more Sp exp you gain (thus more Sp) when you kill a creature.
There are various ways you can create a gap, and doest necessarily require a lot of gold.
For a detailed sp farming guide (at bandit stronghold at lvl 16), and what are the advantages of doing so you can click
here.
You dont have to farm all your Sp at level 16, you can also just level up your charachter normally, but keep a level gap of 1 or 2 or 3 etc, thus accummulating extra Sp (at the cost of slightly slowed character leveling speed) although this is not usually efficient. Whichever method you choose is up to you.
Hope that helps
Syl <3