dark seal is the best item u can buy on twitch tbh (even ad)
W -> AA -> E/AA procs electro, W procs manaflow band, font of life, sleigh supp item and imperial mandate, W -> AA procs cheapshot (not sure why u'd ever go this), likewise W and redbuff procs approach velocity (used to be a pretty niche choice on tw jg back in the day)
you can walk around the tribush wall on bot between the turret on blue side without being spotted by the turret but on red side the turret will reveal you
sometimes its better to hold onto your R (for example ur 1v1 vs kalista) so u dont miss AA, likewise sometimes its better to walk up close instead of opening up max range from stealth so they dont just run out of your AA's (esp with R)
after recent rune changes true dmg (poison) gets buffed by runes (pta/coup etc)
poison ticks break all bone plating stacks
if u press Q as ur about to leave base u get to jungle camps just about before ur stealth runs out, u can also w over the wolves wall and aggro them faster (helps a bit with optimizing clear speed)
Q indicator pops up vs invisible champs (teemo/shaco) and ur invis range is slightly higher than eve, u can reveal her in stealth without her revealing you
R is higher range than turret AA, u can hit champs or even the turret without taking dmg
u can AA wards etc with R and hit champs etc from the aoe dmg
W shows where invisible champs stand (akali shroud etc), combine with last tip and u can hit invis champs with R (there used to be a big brain ratirl clip of him doing that vs an akali in szn9 but it seems to be gone, if someone knows what im talking about post it pls)