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Check this shit off when you think you're done with a site. If there is something you don't check, then you thought SO wrong.
Got Wireframe approved by client
Installed site on WordPress and cPanel
Built internal pages
Checked formatting on 404 page
Accomodated any specific client needs (buying/selling functionality, login functionality, etc)
Tested site responsiveness on mobile devices
Ran SEO test on site, adjusted as needed
Submitted to client for final appraisal
Adjusted site based on client feedback
Think everything is ready to go?
Go ahead, make my day