Raw coding -- Don't leave raw coding on the page like this https://www.fcps.net/Page/125 or this, firstname.lastname@example.org, because it is awkward for assistive devices and screen-reading software.
Informational flyers -- Avoid informational flyers, especially when the text is laid over a JPG image. Simply type the details as an announcement and use the accompanying photo or graphics separately. Example: info flyer
Tip: Such flyers are great for sending home in backpacks or posting on bulletin boards, but not for websites.
Hyperlinks -- In hyperlinks, skip generic verbiage like "Click here." Simply embed the link in the text with words specific to the content.