Create advancement that gives max health or damage

Learning how to make advancements and wanted to make an advancement that when achieved, would give the player +2 max health or something like +1 damage. I also want to make it so that i can add other advancements in the future that can add more onto this. Like i dont want them to affect each other and i just wanna keep adding on. I also wanna reduce stats too with other advancements.