learn matchups and when you're able to trade. usually she can fight at levels 1,2,3,6, and 11 very well
make sure you use W after you're low on energy so that you don't waste part of it
go into practice tool and practice doing her Q auto combos over and over
E is a very underrated damage spell, it stacks conqueror twice and can also proc her passive twice
learn positioning and zoning its especially important toplane because you fight with enemies who can easily stick onto you and kill you
itemization is very important after gunblade is very important. learning which magic pen items to build really really makes her deal more damage
wave management can allow you to gain level advantages and secure a kill. if you have level 6 and the enemy is level 5 it's very easy to kill them.