[FFXIV] Raid Healing Tips you should know about

With patch 6.2 coming up, what's best than studying healing & raiding advices!
???? What would be the most important tip to give in your opinion?
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──── ※ ⏱ Chapters ※ ────

00:00 Intro
00:10 Always be casting
00:40 reDoT
01:00 Safe prog
01:30 AoEs
02:00 Map oGCDs
02:30 Downtime
03:00 Shortcut Tanks
03:30 Cohealing
04:00 Cost & Efficiency
05:05 Outro