I've been regularly writing on the web since 2012 and have a published a couple of books, written for a number of Mac & iOS websites and, occasionally, elsewhere.
iPad Collective. A website I created that lists the best apps and accessories for the iPad.
Back Up Your Mac With Time Machine (2013). This book breaks down each feature of Time Machine, the built-in backup utility of Mac OS X, from setting it up with an external hard drive or Time Capsule to restoring files and even your Mac.
The iOS Compendium, Volume 1 (2014). This is an interactive iBook containing over 40 of the best tips and tricks that iOS has to offer. It contains over an hour of video screencasts.
I've written many reviews, guides, and tutorials, for various websites, primarily focused on the Mac and iOS.