Like the header says, this is a work in progress, I will consider adding more in-depth information / images here later on, but most of this stuff is developed with time or common knowledge if you play taric casually.
On Redside, I try to sit in banana bush (the curved bush near river) and get my team to counter an invade if they try, as multiperson stuns normally mean a won lvl 1 fight.

On Blueside, I tend to spread out further, try to get my midlaner to stand near raptors to see an invade behind red, and i'll either stand in tribush or out in river near tribush to look for invades.

I prioritize getting bravado hits down, basically no matter what, if I begin getting kited I start autoing the melees if my adc is continuing the fight.

Otherwise, I look to press R under essentially 3 circumstances
1)The opponents are past the point of a disengage, immedaitely as possible will I press it if the other 2 conditions are met.
2)This fight will result in a map objective like dragon, herald, baron, or an inhibitor will be taken
OR
3) Any fight if my ultimate will be up for the next dragon/baron spawn.

That's the long and short of it

I tend to build my winconditions around shutting down my opponents wincons (or avoiding our lose-conditions) rather than going for win-conditions like knight's vow on a fed adc, i'd rather do zeke's or anathemas currently to keep the threats down.

Other than that, I'll add in something quick about my decision making for lucidities / radiant virtue, and will hopefully have a video demonstrating more eventually.

For taric, i'm not 100% sure how his passive works (someone smarter than me can test it an let me know) but bravado scales on ability haste in some way.

Besides ability haste decreasing your cooldowns, it also increases the amount of refund each auto of bravado gives

at 60 ability haste and a rank 5 E
it takes 4 hits of bravado at taric's base attackspeed to get another round of Dazzle back, RV/Lucidities is the cheapest way to get 60 ability haste* (for every fight for the 9 seconds after you press R, essentially every objective fight, which is all that matters in my opinion)
at ~90 ability haste you get enough so that you get W back on 4 bravado hits, so you can very freely link up to multiple flanks of a fight and rotate stuns on all lines if you're autoing something as you can see in this clip https://www.youtube.com/watch?v=Hpf8x49MlI0
where I spend the entire fight autoing the baron, but sending out stuns and repositioning my W whenever I see necessary, using Q to essentially weave in multi-person healing or to clutch out extra dmg mitigation for ezreal.

thats about it for now, i'll udpate this guide later on to flesh out this section, but the main meat of the current playstyle of support taric is in here.

Let me know if there's anything you have questions about, suggestions for, or if you want a little more in-depth / 1 on 1 time on this champion, I do casual coaching for free on weeknights and weekends if you let me know ahead of time.