Strength: Strength is how strong you are. Like how heavy a punch you dish out, how much weight you can pick up so on so on.
Agility: Agility is how agile you are. Like how well you can dodge attacks, how well you can climb, and how fast you are.
Endurance: Endurance is how much of a tank you are and how much gas you have in your tank.
Spirit: Spirit is how resilient your mind is to mental attacks and how fast you can think.
Intellect: Intellect is how strong your spells can become and how precise your spells can be.
Magic: Magic is how detailed you can make your magic circles and how fast you can make them.
Magic and Intellect go hand in hand. So, raising one higher than the other does not do much. It is best to keep them relatively even to make sure you get the best out of each other.
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The global average of stats for each race is:
HP: 100
Strength: 50
Agility: 50
Endurance: 50
Intellect: 50
Magic: 50
Spirit: 25
Compared to what the protagonist has right now 8/23/21:
HP: 1000
Strength: 250
Agility: 200
Endurance: 250
Intellect: 250
Magic: 250
Spirit: 175