Setting

Setting up Permalinks
Activate Askimet
Deactivate comments
Add a Gravatar
Change default category from “Uncategorized” to something else (e.g. “News”)
Create archive-, tag-, and category-specific layouts/pages
Change the author of all posts, pages, and CPTs to be authored by the Client’s User(s), not your own Administrator User
Delete unnecessary / inactive users, as appropriate
Make sure all WordPress default posts, pages, and comments are trashed or permanently deleted
delete unnecessary Widgets from the Inactive Widgets area
Verify General Settings are as desired (e.g. www or non-www, new user registration, Timezone, etc.)
Delete WordPress default links and link categories

SEO

XML Sitemap support – submit your sitemap to Google and Bing and improve your SEO

 Ex: All in One SEO Pack, YOAST