Plat 1 support main here, going to drop some knowledge on you.
Other supports like taric are as follows, Alistar, Leona, and Nami. These 3 are going to be the same similar play style as taric, and i will give you a few examples as to each one is like that.
Alistar : A pure tank when he wants to be. That ult makes him just the manliest cow around town. You can run into teamfights and be a pure disruption for the whole enemy team. In lane he's similar to taric because you can not only heal your adc repetitively, but you can also peel and initiate with his headbutt/pulverize combo. That combo takes a bit to master, but once you get it, your golden.
Leona: Same as Alistar when it come to being a beef cake. She throws on her eclipse and becomes a true tank. This support is all about making plays. You can go in on someone and lock them up for about 5-6 seconds depending on how well you are at timing your cc combos. Although a little different than taric, because taric is more about stunning at opportune times, and then healing ur adc when necessary, leona is all about the engage.
Nami: Although this pick may seem a little odd ball, her play style is very similar to tarics. Taric is a much tankier version of nami, but nami has her benefits too. Her heal in lane is great poke and sustain, and her bubble is amazing for engages and disengages. Her Auto attack buff makes her very fun to play with as an adc, and her ult is totally radical duuuuuudddee. (its a wave..... get it?)
Now when it comes to build orders this will always vary in the game you are in. There is no possible way you can just look at an item build and say thats what i'm gonig to build this game. But a few staple items are as follows
Sightstone : Need i explain?
Gold generating items : It depends on what you want to do in the lane, right now for tanky supports the shiled is the way to go, actually on most supports this is the truth right now. Only ones i may argue the frost fang is people like morgana/nami/zyra/annie/sona.
Mikael's Crucible (fuck spelling) : This item is amazing in the heal meta at the moment. Saves your adc or whoever you heal more often than you think, and its great for mana regen.
Locket : Great for facing aoe team comps, and the shiled is amazing for saving and damage mitigation in team fights. This should be a immediate pick up when facing a aoe team comp team
Those are a couple things about support i think everyone should know! Hope i was able to help you about a little bit