If using WordPress, do you sometimes find it hard to remember the template flow and all of the PHP conditionals and classes applied by default?! Be sure to bookmark the complete visual flow diagram which helps maintain an overview of all this.
If you are, it could be because you’ve activated or deactivated a plugin and you need to refresh your permalink structure. Keep whatever common settings you have, save changes and hopefully the 404s will be gone.
Did you know you can easily include variable values in a PHP echo string? It works as long as you’re using double quotes to surround the string. In this article I give some examples of the technique in use and explain its benefits.