Here is a list of my most frequently used equipment, and what I use it for. Click on a link to see it on Amazon. Using these links to buy equipment helps support me.
Secondary camera, B camera for video
Backup in case shit really hits the fan
Large stages, big clubs, festival candids, fashion, general purpose in large open environments
Crowded clubs, group portraits
Creative fisheye shots, ultra wide angle shots with post-production correction
Nothing beats this lens for portraits
Products, beauty/glamour, fashion, candids, single-person portraits, general purpose
General wide-mid range daylight shots
One-person interviews/narratives, candid videos
General purpose audio and replacement for in-camera mic
Remote flash triggering for portraits, fashion, publicity, etc.
General-purpose light diffuser. Great for club portraits, and softening off-camera flash in fashion/glamour.
Usually in my bag for fashion shoots. Mainly useful for bouncing sunlight.
A superb all-use tripod. Don't skimp on a good tripod -- my first was a cheap amazon basics and started falling apart in less than a year.