How does ranked differ from normals in play

I've tried ranked and lost all 5 of my current placement matches, and when I tried a champ I sat at a 71% Winrate in for normals, I ended up with a 0% win rate over 3 matches. I understand there's a different mentality for ranked and normals but I just get outplayed by the enemy laner constantly. Is there any difference in how a person should play in ranked (in any division), and how they should play in normals (which, mind you, is not bronze)
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