In RPGs, your party of monsters(if Pokemon) or party of characters(like Final Fantasy or Tales of series) have different stats depending on the RPG you're playing. Stats is your party's summary in battle to display it's battle attributes. Common stats are HP, MP(something similar), etc. It is important to care about your party's stats so you can get better in the game. Learned how to played RPGs and care about your stats. Stats are important so you need to level up your party and use items to increase it. You can also use certain moves in battles to raise your stats temporarily. When you increase your stats, then your party gets stronger in battles.