If you land your Q, YOU WIN THE TRADE!
If you have range advantage, space properly and you will ALWAYS WIN TRADES!
If you have good communication and synergy with your support, you will ALWAYS WIN LANE! USE PINGS OFTEN!
YOU DO NOT HAVE TO BUILD FULL DAMAGE TO CARRY GAMES. BUILD DEFENSIVELY AND 1V9.
also watch my stream hehe uwu very educational

Quickblade is more useful against team comps that are centric around high-cooldown, important abilities that are hard to bait out. If you get zoned just by an enemy champion being on your screen, then it's a match for quickblades so you can auto a few times then back off before re-engaging, without your w cooldown being punished at all. Yasuo windwall, Blitzcrank hook, Diana ult, Malzahar flash+ult, Sejuani ult, etc. are all things that make quickblade viable. If the enemy is likely to build a lot of stasis, or has a lot in their kits, then it's also a good option. It's also easier for beginners!

Rageblade shines in explosive, short fights. If the enemy doesn't have an option to escape once they engage, or some way to survive until your w runs out, then rageblade will outshine any other item. After rageblade + BotRK, being able to auto throughout the entire duration of your w means you just got a pentakill.
Consider sitting on a zeal after you purchase rageblade if you want to push your lead harder.

Stop going to u.gg for builds. Stop importing that build from blitz. Just because it's popular doesn't mean its good, or good into everything! Be creative with what you build, use your brain, and mix and match builds from this guide to find what is the best into each enemy team. You're playing one of the only champions that can reliably pull items from every class in the game, abuse that advantage as hard as you can!

I'm Caiky, I've been the rank1 kogmaw world for the last 2 seasons, peaking 550lp grandmaster. I am also a masters midlaner, even without playing AP kog there. I also sometimes offer high quality coaching for every role (besides toplane) when i'm not super busy.

I also may or may not duo lulu/yuumi players at any elo :3

I rarely run bloodline after the nerf that brought it down to 6% lifesteal when fully stacked. The extra 100hp it gives is nice, and more survivability is always useful, but I personally think alacrity gives more value in every elo besides d2+. Try them both out in a variety of matchups, I know some other high elo kogs personally that completely disagree with my stance on alacrity vs bloodline, it's just preference.
Resolve used to be something I would run nearly every single game, but treasure hunter just outshines it most matchups now. Resolve is still the best choice against your most difficult lanes, but once you are more confident in your ability to pilot kog then be sure to sacrifice some of the forgiving runes and items for more damage or snowball potential. Building tankiness will always be the easiest (and for most the best) way to play kog, but mastering positioning and teamfighting will always beat even the best itemization.

MOST LULU PLAYERS DON'T KNOW WHAT THEY'RE DOING! If your duo plays lulu, send them to my lulu guide! Ask your random lulus to build MOONSTONE! ITS BROKEN AND BETTER THAN BATTLESONG EVEN AFTER MULTIPLE NERFS! ABUSE IT!