There are two types of glyphs in WoW: Major and Minor.Major glyphs will usually make a bigger difference in your characters rotation. Minor glyphs are just little bonuses that really do not effect much about your gameplay.
For major glyphs, there are two that are most commonly used and then there are a few others that will vary per fight and how you heal in general.
Glyph of Wild Growth is one that is widely used today in WoW. This glyph allows you to hit one more target with your Wild Growth spell (making it hit 6 targets instead of 5). With all of the raid damage in ICC, it is a few helpful tool.
Glyph of Swiftmend is another popular glyph and my favorite. This allows you to use the Swiftmend spell without consuming the Rejuvenation or Regrowth HoT. This saves mana from being wasted by reapplying the spell.
The third Major Glyph is a personal choice, but there are three very useful ones:
Glyph of Rapid Rejuvenation is the current one I am using. This however greatly changes the way Rejuvenation is used. The glyph lets your haste now reduce the time between ticks of the Rejuvenation HoT. Sounds wonderful right? Faster heals! However, this greatly decreases your ability to cover the entire raid with Rejuvenations. But this will make your Rejuvenation more powerful in short time periods. This helps with keeping tanks alive. You will notice your time on Rejuvenation HoT decrease from 18 second to around 11 seconds (depending on your haste or buffs)
Glyph of Nourish is what I was using before I switched it to the Rapid Rejuvenation glyph. This is a wonderful tank healing glyph. This increases the amount healed by 6% for each of the HoT’s you have on the target. This can increase your healing by an amazing amount. Most tanks will always have a Regrowth and a Rejuvenation on them, which is a 12% increase in healing. If for some reason the tank has Lifebloom on them too, that is an 18% increase. If you are finding yourself having problems keeping tanks up, I would get this glyph.
Glyph of Innervate is a glyph I have thought about trying in the past, but have not. This is a good glyph when you are having mana issues on longer boss fights. It allows you to regenerate 45% of your base mana on top of what your Innervate already provides.
Now there are a few more Major Glyphs, but I find them to be weaker:
Glyph of Regrowth is a good glyph but has a flaw to it. This glyph allows you to receive 20% increase in healing when you cast Regrowth on a target that already has Regrowth on it.
Glyph of Lifebloom let’s Lifebloom last one second longer, which in turn will let you cast it less and be less depended on its rotation. However, with the mana cost of Lifebloom and how ineffective it is now, it is rarely used.
Glyph of Rejuvenation will let your Rejuvenation heal the target for 50% more when they are below 50% health. This is very situational. It is pretty rare for targets to be sitting at lower than 50% health.
Glyph of Healing Touch has a lot of new thought going into it, especially with the Lich King fight, but I am not sold yet. The glyph reduces the cast time of Healing Touch by 1.5 seconds, mana by 25%, and healing done by 50%. This could be a good way for druids to “flash” spam like pally’s and priests. But since no matter what there is the Global Cooldown Issue, using the Naturalist talent and this glyph will not keep this heal at less than a 1 second cast.
Glyph of Rebirth is useful but I would never replace it for another one of these better equipped glyphs. This allows the target to be rezzed with 100% health.
There are only two useful Minor Glyphs:
Glyph of Unburdened Rebirth lets you not need reagents to rebirth!
Glyph of the Wild reduces the mana cost of Gift of the Wild and Mark of the Wild by 50%. Helps rebuffs to go faster after wipes =D ! This also lets you buff more effectively after a rebirth.
The third really is personal preference, but nothing really makes a difference!
Hope this was helpful to new glyphing Druids!