The ones that cost most.
USING A GMAIL ADDRESS AS THE BUSINESS ADDRESS
Undermines credibility, and it is free to fix with hosting you already have.
NO PHONE NUMBER ON THE SITE
Many customers want to call. A site with only a form loses them.
A SLOW SITE
Enormous images, on a market where most visitors are on mobile data. They leave before it loads.
NOT REGISTERING THE DOMAIN IN THE BUSINESS NAME
Registered by a developer or an employee, and then disputed when the relationship ends.
LETTING THE DOMAIN EXPIRE
The site and email stop, and recovery is expensive or impossible.
TAKING ORDERS ONLY BY MESSAGE
No record, no payment trail, and it exists in one person's phone.
NO BACKUPS
Turning a small problem into a rebuild.
IGNORING EMAIL DELIVERABILITY
Invoices and confirmations landing in spam, and nobody knows why.
BUILDING BEFORE TESTING DEMAND
An elaborate site for something nobody wanted.
NOBODY MAINTAINING IT
The underlying cause of most of the above.
