Support Build. Help.

Hi guys, I'm maining support. So I want to ask you something about support items. I watch regulary LCK, LEC and LCS. I saw there that supports build often different items. For example: {{champion:12}} buys sometimes {{item:3050}} as first, but also sometimes he goes for {{item:3800}}. On the other hand {{champion:201}} goes for {{item:3107}} or {{item:3109}} or {{item:3190}}. I build on Alistar mostly {{item:3050}} as first item. But I started playing {{champion:201}} and {{champion:3}} too and I dont know in which order to build items. I would be really thankful if someone can explain me when to build specific item. Thanks
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