If you want details for the not-so-obvious tweaks that you can do for the following, I suggest you read the full article here.

Changing Built-In Settings
Changing Permalinks
Image Metadata
Custom Excerpts
Plugin Enhancements
Code Enhancements
Redirect Single Search Result
Pretty Links
Auto-Link Text
Display All Images for a Post
Insert Content Between Paragraphs
Create Your Own Shortcodes
Add Old Post Notices Automatically
Redact Sensitive Content
Change Your Excerpt’s Length