Greetings! Welcome! Have you checked out the_great_tumblr_purge and the comments to the official dw_news welcome post? There's some guides there, and in the latter, also some discussion about etiquette.
I believe someone pointed out that pretty much the only major etiquette thing is, if something is shown to you privately (an access-locked post, for example), don't share/publicize it outside of that access group. Maybe that's obvious, but it's a biggie.
More minor: It's normal to put large photos or NSFW behind a cut (using <cut></cut>). Most communities are fine with you crossposting content; e.g., linking to a fic you posted on AO3, reposting your own art, etc. If you're interested in a journal or a community, feel free to subscribe unless it explicitly says not to -- it's a free action, because subscribing doesn't get you access to their private/friends-only posts anyway, so you're not intruding on anything.
In general, DW is pretty live-and-let-live. It gives you a lot of privacy and control. The flip side is that you have to go out of your way to look for people and communities that you're interested in. There's a lot of tools for that: the interest search, the sitewide text search, checking out the reading pages of people you already follow, browsing Explore -> Latest, etc.
(Note that allll of those can be avoided by someone who doesn't want to participate in that kind of discovery -- interests are opt-in to begin with, and there are tickboxes to let you opt out of the rest. See what I mean about privacy being a big deal?)
no subject
I believe someone pointed out that pretty much the only major etiquette thing is, if something is shown to you privately (an access-locked post, for example), don't share/publicize it outside of that access group. Maybe that's obvious, but it's a biggie.
More minor: It's normal to put large photos or NSFW behind a cut (using <cut></cut>). Most communities are fine with you crossposting content; e.g., linking to a fic you posted on AO3, reposting your own art, etc. If you're interested in a journal or a community, feel free to subscribe unless it explicitly says not to -- it's a free action, because subscribing doesn't get you access to their private/friends-only posts anyway, so you're not intruding on anything.
In general, DW is pretty live-and-let-live. It gives you a lot of privacy and control. The flip side is that you have to go out of your way to look for people and communities that you're interested in. There's a lot of tools for that: the interest search, the sitewide text search, checking out the reading pages of people you already follow, browsing Explore -> Latest, etc.
(Note that allll of those can be avoided by someone who doesn't want to participate in that kind of discovery -- interests are opt-in to begin with, and there are tickboxes to let you opt out of the rest. See what I mean about privacy being a big deal?)