Healing doesn't really have a rotation of spells to go through like a DPS spec does, however, there are often certain types of situations that arise where you can respond in a certain fashion. I've detailed some of the most common situations below, as well as how to heal them. In the heat of battle, you may not always be able to stick to these things exactly, but with a little practice they should become second nature.
If you have any questions or feedback, you can leave a comment below or contact me on Twitter @PrestonDvorak.
November 24, 2017 (Enchants, Gems, Consumables) - Updated raiding enchant and consumable information to favor mastery.
November 24, 2017 (Stat Weights and Gearing) - Updated Best in Slot, Legendary, and Trinket information for Antorus, including the new "item level worth" system for trinkets.
October 25, 2017 (Restoration Druid Guide) - Guide reviewed and updated for 7.3.2, no major changes needed. Added new notes about T19 to the Stats and Gearing page.
October 21, 2017 (Artifact Weapon and Relics) - Added date used to calculate item level worth of traits and abilities to the bottom of the page.
October 12, 2017 (Artifact Weapon and Relics) - Added approximate item level worth of relic traits and crucible abilities.
September 26, 2017 (Addons) - Added the proper import code for the Cenarion Ward WeakAura.
September 25, 2017 (Restoration Druid Guide) - Added new WeakAuras and updated Grid saved variables.
September 12, 2017 (Restoration Druid Guide) - Added simulation information for Netherlight Crucible abilities and adjusted rankings.
September 05, 2017 (Restoration Druid Guide) - Added Invasion Point gear to best in slot lists.
August 27, 2017 (Restoration Druid Guide) - Added Nether Crucible information to the Artifact page.