I actually wanted an account because it's an awesome platform at least for me xD
As I said, nothing specific, only basics and that stuff.
Some good tags to start off with to build your archive (building off of what haiz said):
-if there's an animal in the post, tag it
-if there's a fandom in the post, tag it
-if you really like the post, tag it "fave" or "favorite" or "favorito" or something similar
-have one single tag you use for all your art so you can direct people to it when they ask and also find your stuff easily
-same goes for edits
-same goes for selfies
-same goes for anything you do, really
SHORTER TAGS ARE EASIER TO TYPE QUICKLY! This seems intuitive but if you have xkit's one-click posting you'll have to type them all out by hand and that's annoying and boring to do over and over again. Those extra three letters will be the death of you. Trust me here.
DON'T GET INTO ARGUMENTS WITH PEOPLE it's awful and convoluted and you'll be wrong, somehow, and three years later you'll regret it. i promise you. just don't do it.
Post your own stuff if you want to get followers and tag it! Followers take a while to get but once they start to accumulate,
they speed the heck up and soon you'll be a Foncy Famous Bloge
When you're posting your stuff (this goes for any online site but tumblr in particular) the weirdest things get notes. Currently, my most popular art is this really weird Emil and Lalli expression sheet thing that has really wonky art but I swear to god it gets more notes
every time somebody new joins this fandom and occasionally you will be very >:^I at the weird distribution of attention but it's okay, they're just random nerds on the internet who don't really matter at all.
If you get famous you will get anon hate. Don't worry about it. It's more dumb people on the internet using their internet abilities poorly and making bad choices. They are Dumbs and they don't matter either.
xkit. xkit. xkit is the savior to the """tumblr experience""". it only works on computers (not mobile or the app) but it's wonderful and Great and i love it. it does so many things and it's best to mess aorund with it yourself to find your happy place ( •̀ᄇ• ́)ﻭ✧
SUMMARY
TAG THINGS, DON'T FIGHT PEOPLE, XKIT.
HAVE FUN