Whatever D&D race you choose for your character, you get a trait called Ability Score Increase. This increase reflects an
archetypal bit of excellence in the adventurers of this kind in D&D’s past. For example, if you’re a dwarf, your Constitution increases by 2, because dwarf heroes in D&D are often exceptionally tough. This increase doesn’t apply to every
dwarf, just to dwarf adventurers, and it exists to reinforce an archetype. That reinforcement is appropriate if you want to
lean into the archetype, but it’s unhelpful if your character doesn’t conform to the archetype.
If you’d like your character to follow their own path, you may ignore your Ability Score Increase trait and assign ability score increases tailored to your character. Here’s how to do it: take any ability score increase you gain in your race or subrace and apply it to an ability score of your choice. If you gain more than one increase, you can’t apply those increases to the same ability score, and you can’t increase a score above 20.
For example, if the Ability Score Increase trait of your race or subrace increases your Constitution by 2 and your Wisdom by 1, you could instead increase your Intelligence by 2 and your Charisma by 1.