First of all let me say that this is my personal build maybe you find him not good but this is how I prefer to play TARIC depens on your playstyle. this is also a very simple and fast guide

Lets start with the runes
for the runes i have very standard support runes.

-8.55 Magic Penetration (Marks) (greater mark of insight)
-12.69 Armor (Seals) (greater seal of resilience)
-12.06 magic resist (Glyphs) (greater glyph of warding)
-78 Health (Quints) (greater quintessence of fortitude

this are very standard support runes and you can use them for more than only Taric, you can almost use them for every support depens on your playstile

For the masteries i go 0/9/21
The 9 defense is for the tanky part to defend and resist the enemy damage
and the 21 utility is for the additional mana regen and additional mana
also for some additional gold per 10 seconds what is very important by a support
you have also some additional gold to start with.
and at last you have some more cooldown reduction.

i prefer to play Taric as a aggresive support
Taric is very strong in early game with his stun (dazzle)
With That it is very easy to take first blood
but do not play too agressive that can quickly cost your life

as TARIC you have much armor as your W (shatter) not on cooldown is
so use this advantage to absorb the hits instead of the ad carry
This is also useful if you are getting gankt and you see it too late (for some reason) usually
you let your ad carry run first and you behind him/her for absorb the hits most of the times the support dies if you do it like this way but whit taric,s additional armor is this a way to stay a life so thats why you need to max you w (Shatter) so fast as possible.

I hope that you liked my guide/build
i want to say sorry for my bad english but english is not my native languages
please leave a comment with what I did well and what i could do beter
this was my first guide

thanks for reading and using my guide