Gwen Guide

Tips for Playing Against Gwen

-Not super bad in lane, but it can get horrible later if she split pushes as she should. Hopefully you won lane hard, or have a team that can deal with her.
-Move sporatically to avoid her Q's center damage, and take grasp trades when she doesn't have Q stacked.
-Also move sporatically if she ults, or you can bait her ult and then W out right away. Also, her ult CD starts on first cast instead of third. Kinda funny.
-Gwen has no CC, so sometimes you can demolish tower plates and get out for free if it won't get you stuck in a bad spot in lane (but perhaps you can also back and TP)
-She's pretty easy to run down with ghost, and you can often win fights after first item if you're even and don't let her heal a ton off ult.

Heartsteel

Heartsteel against a %HP damage champ, I know. But it helps in multiple ways. Your range is higher, and the extra damage from heartsteel and tahm kench passive is nice vs squishies.
Hollow Radiance

Really good for survival against Gwen, and stopping her split-push. You could go Heartsteel into Hollow, or even just Hollow right away if you feel you need it.
Swiftness Boots

Swifties is really good against Gwen, as you can move more sporatically and dodge Qs and ult shots, and any hit ult shots will slow you less also.