Here is my tutorial how to upgrade Motorola Nexus 6 (shamu) to latest Android version manually. It is universal walkthrough for both rooted 6.0.* (Marshmallow) and 7.0.0 (Nougat).
To mess around with Android-powered devices you will need Android SDK tools: Android Debug Bridge (or ADB) and Fastboot. Here's how to install them on Linux Mint.
Using Raspbian GUI with default user pi might be not fun, but if you decided to create new user, you might have missed setting up polkit configuration to have new user in administrative authentication dialog. Here's my first Raspberry Pi guide to fix it.
Short guide how to start recording through S/PDIF line in digital input using Sandberg USB Sound Box 7.1 on Linux Mint.
Lightbox Plus Colorbox plugin doesn't work with WordPress galleries when Avada theme is installed. Here's how to fix that.
Fix Avada theme for WordPress issue - breadcrumb trail displaying categories hierarchy in wrong order.