So what defense do you build first? Against AD, AP, Mix Damage, and True damage altogether

So some of these if not all, will always do bunch of damage equal base on all type of damage source.
You build hp to take more hits You build armor to resist ad You build mr to resist magic
But its never enough against Champion with Mix Damage, especially True Damage
I find Camil to be the most busted with true damage And then Irelia second