Creating a character
Creating a character is a 2 step process:
Create a background
Select a class
Characters at higher levels
As characters gain level, their class grant them most of their new abilities. Certain things are not dependent on your class, but increase as your overall levels increase regardless of your class progression.
Proficiency bonus
You start with a +2 proficiency bonus. This bonus increases as you gain levels:
5th level: +3
9th level: +4
13th level: +5
17th level: +6
Ability Score Increases
As you gain levels, your ability scores also increase:
5th level: You increase one ability score of your choice by 1.
10th level: You increase one ability score of your choice by 2 one or two ability scores of your choice by 1 each.
15th level: You can distribute three +1 ability score increases among your ability scores as you see fit.