A handy spreadsheet listing the projectile speeds for each projectile ability in Overwatch. It's not always necessary to know exact values, but comparing these values can be helpful at times, too.
The author of this spreadsheet has also created a neat (but incredibly confusing for a math-dumb person!) projectile speed calculator. It works based on a screenshot and some intense math I guess!
A 24-part video series on aim, from the fundamentals to more advanced aspects of aiming.
Speakeasy's challenges are PVE (player versus environment) challenges intended to help you get better at certain heroes and certain aspects of the game. Speakeasy provides detailed guides for settings on your custom games, what bots to run, and what exactly you are trying to accomplish in completing the challenge. Speakeasy's challenges are indeed challenging, and you may find them an excellent way to increase your Overwatch skill.
A detailed guide on the very specific subject of crosshair customization. This guide provides a helpful image album showing different crosshairs and their settings, as well as detailed written information on choosing the crosshair that will work best for you.
An excellent resource for improving your aim. This resource introduces various types of aiming, ways to practice your aim, even physical aspects to aiming, and more.
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