ah... I can try to help u o_o but idk if you will understand everything xD
to upload a drawing you need to go to your
profile -> submit art (the little blue button by "newest deviations")
creat your deviation
To upload a drawing I always use "choose a file to upload", its a blue button as well and can't be overseen~
so, the next would be that you have to search the drawing in your computer's folders and click on it.
For fanfics I use "Enter text" btw~
contains ature content? just click on the "?" next to it, I guess it explains everything needed xD
Title/Untitled - yeah... the title of the drawing, there isn't much to say I guess~
between +add media (with that you can also use that gif image thingy) and "title" is a free space, you can write a description there~
Keywords - I don't really know for what it is, but I guess it is so the people can find easy, I use it always to describe the fanfic/fanart with a few words
select catogary ah, just click on it, what it is, how it is made (digital or traditional), I guess you will be able to find it out by urself (sorry I can't say much to that)
and I guess everything others is sure too, if you are done click on the green button "submit now" (if its gray you forgot something)
gifs like and
how I already told you you can use "+ add media"
or you simply use one of many plz account, so if I want to insert I'm simply writing :icon hyorismileplz: without the space between "icon" and "hiyosmileplz" (thats how you link the profile of other deviantart members too btw.. just don't forget the ":" at the begin and at the end or it won't work)
ah... I hope it kinda explained what you wanted to know... ;w; sorry for my creepy english.. it isn't my native language >w<