Um just a little confused about the Meta right now

So... I have no idea what exactly a meta is besides being basically what works at this time as far as builds/positions/objectives. I really want some detailed info for this meta so I can be successful with whatever role I play (main support Karma) and what I'm likely going to be facing. Noticed that my success depends heavily on bottom lane unless we've got a hard carry, which is kinda annoying. I remember when it was duo top. Also since I'm still kinda nooby it would be neat to get some tips on identifying metas in the first place, for the future :3
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