O.K. Thanks to a nice person who adviced me to check out my code through a validation site (actually she nicely provided the link), I have fixed most of the invalid code. However, there are 10 left which perplex me. The messages all appear to indicate that my ordered and unordered lists are "in the wrong places" and also the divs for the excerpt reloaded plug-in.
The validation is here
The website is The Weekend Chef.