Stat Points show how skilled is your character, his speed, strength, health and chakra amount. The stat points can be earned by training, more words you do in a training, more SP you receive for it. (
Informaiton on training)
StrengthStrength shows how strong is your character. Strength is very effective when used by taijutsu users, but also is useful when lifting heavy items such as weapons or throwing them further and faster.
DexterityDexterity shows how fast is your character. When wanting to move fast and deal fast attacks, dexterity is important. It also shows the reactions of your character, meaning bigger your dexterity, faster are your reactions on attacks.
VitalityVitality shows how big is your character's health. Vitality is a very important stat, as it shows how much damage can your character take before he or she will be knocked out and lose the fight.
ChakraChakra shows how much chakra your character has. This is ninja's main weapon. More chakra means more techniques you can use in one battle.