Fids builds
Can someone help me? Should I build full lifesteal, full AP, or both for fiddlesticks?
Can someone help me? Should I build full lifesteal, full AP, or both for fiddlesticks?

This is basically the only Fid build worth using. Maybe switch Abyssal for Void Staff if the enemies are going heavy on the MR.
i guess. but i like the tankiness of the abyssal tbh.
I am not sure if you are being serious. Fiddle doesn't benefit from lifesteal unless you are building AD, and spell vamp has been removed from itemization. If you are serious I would suggest full AP or even trying out some tank builds since tank itemization is pretty strong right now. When I say tank builds I mean something Swain would build, not necessarily a SFC.
You want to be building a tanky AP build on Fiddlesticks, with items like

. Zhonya's Hourglass in particular is really good on Fiddlesticks because he can use his ultimate and use the Zhonya's active to guarantee a portion of his ultimate's damage.
You are normally going to jungle on him, so
is going to be your choice of jungle item on him.
Getting any degree of AP items is good as well, although usually you want to get your tankier AP items on him first.
rylias first > zhonyas > abyss scepter.