Well, first you have to find out what caused the damage. It could be a leak, a hole, or something caught in the gutter that's preventing it from working properly. Once you know what's wrong, you can take steps to fix it. If it's a leak, you may need to replace the gutter section altogether. If there's a hole, you can patch it up with some metal flashing or silicone sealant. And if something is caught in the gutter, you can try to remove it or poke a hole through it so the water can flow through.

It depends on the nature and severity of the damage. In some cases, it may be as simple as replacing a few sections of gutter; in others, it may require more extensive repairs, such as replacing an entire section of gutter or rebuilding part of the roofline. If you're not comfortable doing the repairs yourself, it's best to call in a professional who has experience with these sorts of things. A botched repair job can end up costing you more in the long run, so it's always better to be safe than sorry.