Attributes

• Strength sets your weight carry limit (STR*6) and helps you do damage in melee
• Constitution increases your health pool and lets you survive physical strain
• Dexterity makes you hit more accurately and perform a wide range of skills
• Agility makes you harder to hit, and move at a rate of 2 ft/round per point of AGI
• Intellect lets you memorize more, and helps mages cast higher level spells
• Wisdom lets you resist magic, and helps priests cast higher level spells
• Charisma affects your standing with strangers

An attribute's modifier is basically +1 for every 2 points above 10, or -1 for every 2 points below 10.

Your modifier is added to certain rolls explicitly when needed. For example if you're asked to "roll for Intelligence", you roll a d20 and add or subtract your INT modifier.

"Advantage" on a roll means you roll twice and pick the best outcome, while a "disadvantage" forces you to pick the worst. If you have more than one advantage, you roll one more dice, and so on. Every disadvantage cancels out an advantage!

"Proficiency" with a weapon type means you have advantage on accuracy. You can attain mastery using a talent, if you wish, to confer even more bonuses.