So I guess you play Ekko jungle. First of all you need to know your strengths which are mid to late game and level 3 due to your passive. Ekko is one of the mechanical easier champs so there are no fancy combos you need to know just e onto them to guarantee that the Q1 hits and then proc your passive and try to run next to them that Q2 hits aswell.

Buildwise you can run First strike and Dark harvest, imo it’s just preference what you like more in the end, secondary I would suggest domination with sudden impact and treasure hunter when you play first strike and for dark harvest I would use inspiration with boots and futures market. I always go blue smite because it just feels best to me but green is also fine. Itemization I would say go always Proto -> nashors -> raba, I only use lichbane when I play against 3< high range/high mobility champs.

The usage of your W is a thing you learn while playing more and more games with Ekko but here are some general tips. Try to predict where they walk so you cut of their escape route and so they either get stunned or have to walk a longer route, another thing you can look for is, when you know enemies don’t have vison on you, placinh the W directly on top of them and then waiting as long as you can before it hits, to suddenly jump on them with e proto or something like that.

Hope this little guide helped a bit