Yeah, annual rebalancing is a thing if you’re going that way. You’ll need less rebalancing if you invest in a total world index fund (auto-rebalances domestic+foreign stocks) or a Target Date Fund (auto-rebalances everything for you). I’ll also note that ideally you shouldn’t sell any positions while rebalancing, just start buying more of the other thing. If your plan is 30% bonds/70% stocks and you’re at 25%/75%, pump your next paychecks into bonds until you reach the right ratio again.