Reset Perma-links so that page names are actual names not numbers (better for seo value)
Addition of security plugin –Wordfence- (free version) protects against hackers and protects site files from modification
Updating of all theme files, removal of any unused plugins
Turning OFF of commenting on pages/posts to reduce spam comments as this can include links that allow for hackers to access the site
Addition of updated code from mailchimp for the right hand column