I Need Healing! A Guide to Why You’re Not Getting Heals

An excellent guide on the specific subject of healing, and why you aren't getting any. The guide explains some basic reasons why you may not be receiving healing, and what you can do to mitigate the current lack of healing. This guide is especially useful for DPS and tanks with high mobility, but can apply to every hero.

Doc’s Overwatch Support Strength/Weakness Guide

An easy-to-understand guide that covers some basic strengths and weaknesses of all the current Support heroes. This resource has the added benefit of being excellently formatted, with easy-to-parse charts if you're really into skimming.