These are the problems I actually find when I open real local business sites, week after week. None of them need a developer to spot. Each one has a 10-second check you can do on your own phone, right now.
Most people find you on a phone. If your number is plain text, they have to memorize it or copy it, and plenty of them won't bother.
Sometimes the number looks tappable but the link behind it is broken: a wrong country code, a town name stuck in the number, or stray quotation marks. Tapping it fails or dials a stranger.
A footer that still says 2020 tells a visitor nobody is looking after the place. It is the easiest thing for a customer to notice and the easiest thing for you to fix.
Phrases like "Lorem ipsum," "Your text here," "Slide title," or a stock company name left from the website builder make a business look unfinished or even fake.
A "Book now" or "Learn more" button that does nothing is worse than no button, because the customer already decided to act and you lost them.
I have found email links that open a blank message to a different company, a placeholder address, or even the website builder's own homepage. Customers who try to write to you hit a wall.
When a site is built on a developer's computer, some links keep pointing back to it. To a visitor the button just fails, so nobody can join your mailing list, register, or order.
Older sites that haven't been updated sometimes get spam links to gambling or pill sites slipped into the page, often at the bottom. Google notices, and it can hurt how you show up in search.
A COVID update from 2020, a holiday notice from two Decembers ago, hours that changed years back. Out-of-date news makes every other thing on the page harder to trust.
Browsers warn visitors away from sites without a valid secure connection, and a page that needs pinching and zooming gets closed in seconds.
Every example here comes from sites I opened myself while looking for local businesses to help. I leave names out on purpose. This is a checklist, not a call-out.
Paste your address into the free health check and I'll load your real site and tell you in plain English what's broken. No email, no signup.