Water over the edge, sagging runs, or a quote for new gutters.
Gutter materials and styles, what repair and replacement cost, whether guards are worth it, and when the problem is really the fascia.

Price per foot by material (aluminum, seamless, vinyl, steel, copper), what changes the quote (stories, downspouts, guards), and a fair total for a typical house. Dated sources.
The signs gutters need replacing and what the job includes.
Common problems (sagging, leaking seams, pulling away, overflow) sorted into cheap fix vs replace, with prices.
What a gutter cleaning costs by stories and length, how often, and why ladders on a second story are a pro job.
Guard types (screen, micro-mesh, reverse-curve, foam), what each handles, and installed vs DIY-kit price.
Seamless vs sectional and the materials compared, with price per foot.
What the downspout does, sizes, how many a house needs, and part and install price.
Why water must leave the foundation, extension types, and the price. A cheap part that protects the basement.
What a rain chain does, where it works and where it overflows, and the price.