I'm looking at the Character Advancement table on pg15 of the 5e Players Handbook. It shows that levels 1-4 have a +2 proficiency bonus each, levels 5-8 are +3 each, etc. I don't know if it is telling me to increase my proficiency bonus by that much at each level or if it is an absolute value.
In other words, suppose I level up to 6. Is my proficiency bonus 3 or 14?