Taking the job of creating the site, do not rush. Do everything in stages and systematically. First check to see if everything corresponds to each item in the ToR. Make sure that the site has the design and structure agreed upon and spelled out in the assignment. Check layout and content filling (if provided by contract). Fix each stage and each item with a signed acceptance certificate with comments and suggestions for revision.
Do not accept the work until you yourself can not carry out basic manipulations with the site. It’s best to record the video instruction for use in the admin panel.