I did not realize that Mobafire voted on some of the build, but that is great to hear. As I mentioned above, I am still very new to Mobafire and this is the only build so far, but to hear that they liked the info/build is great. I will try to add some stuff (pictures, additional info) when I understand it more.

My advice is to add in some coding to give the text some color and visual appeal. There should be a coding guide while you are on the editing page that walks you through all the basics of coding on Mobafire. Since you mentioned how this is your first guide I will just add in that coding your guide is what makes the difference from Rabadon's Deathcap and Rabadon's Deathcap and allows you to insert pictures along with many other things that improve the visuals of your guide.

I like the guide itself and the information in it. I have a guide I made for AP Mid Galio so I like seeing the support guide on here (Big Galio fan). You might like to hear that Mobafire rated you the 2nd best Galio Guide, not by player votes or popularity but the website staff itself.

Ah, Galio. An old time favorite of mine. I played him as support for a LONG time due to me not having any real support champs at the time.

If I may make a suggestion to this build, though, I believe starting off with Relic Shield then Spellthief's Edge is far better. Galio is a melee champ, so, he can benefit from the execution. Yes, it doesn't give you that extra boost in AP, but youre a tank support, your not meant to deal damage, your meant to hold down the enemy to either feed your ADC, or keep him alive.

After that, getting a sightstone helps ALOT, and then going for some magic resist is best. Once you have that, you have 2 options: go for armor (which you will honestly need, there is no avoiding it), or AP.

Just a suggestion though. :)

health seals + armor quints > armor seals + health quints, just a friendly fyi