How to play Kayle more effectively?

I get that Kayle is an extremely simple champion mechanically but she's not completely braindead. I always seem to have a lot of death's on kayle but it's not like I feel I am going in too hard. I don't really know how to play team fights as her or how to play lane. I just don't really "get her" even though I really like her.

EDIT: The joke is that it's the wrong subreddit.

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