You can find the some of the best Wordpress Tricks to Make your theme even better here. For further tricks you can see the original post here. I have found some of the tricks are better so they are listing below for you:
How to Disable Commenting on Posts Older Than 1 Month
A great way [...]

A while ago I was looking around for how to make my own comments a different color on my blog. Most of the advice was along the lines of “Add code to check if the commenter’s email is the same as the email address of the blog’s author.” Can you spot the flaw in that [...]

The Ultimate Guide to the WordPress Loop
In this tutorial, I’ll be going over The Loop, and how WordPress uses it to display your posts and pages. Keep in mind, this is slightly more advanced than our previous tutorials. Hopefully you will find this ultimate guide easier to understand than what’s available in the WordPress documentation. [...]

Turn your attention to the sidebar of this site, where you’ll find lists of posts underneath subheadings like “Must Reads,” “Improve Your Blog,” and “Worth a Look.” As you might have guessed, I use categories to control the content of each list, and now we’re going to examine how you can do the same. For [...]

1. Custom login page
I was actually inspired to write this post because of a 9rules note I started recently. David Airey beat me to the punch with his own version and credit should go to ayushsaran for starting the whole thing but here is mine at last.
This one isn’t so much a tip or trick [...]