I am a new(ish) player to splatoon 3, i joined splatoon 2 about a year after final fest and i got splatoon 3 also after final fest :( so i dont have to much experience, however i have quickly learned the basics and a bunch of higher tech (i think) and i play a bunch of salmon run as well as the occasional drops to casual turf war and a decent bit of anarchy (im not good, and for some reason i keep fighting gods in C+)
thats basically all you need to know, if you see any post like gear builds please feel free to give any advice you have about it, im open to hear about ways i could improve my skills and setups 
