If you have the traders set up between your settlements with the Local Leader perk, you can choose to make food and water in one place and let it get distributed automatically. . The bandit raids are based on how much food and water settlements have, so most of your settlements will get raided only rarely. There is a downside, which is that every dang settler in the other towns will complain that there isn’t enough food and water, because they don’t know to look at the trader network.
Also, raids spawn in a place randomly clean from list for each settlement. Building walls isn’t going to save you in every settlement because there is often a spawn location within the settlement. I’m not still salty about it after building a wall and turrets and lights all the way around sanctuary’s island only to have raids down in the middle of the settlement, why do you ask?
Also, I’ve never used VATS in a 3d fallout game, so be aware it’s totally possible to just skip it entirely and save your points for other skills.