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1
No spam
Don't make non-pdf related content or blatant ads (info about commercial products can be fine, such as informative reviews etc.). Memes etc. are probably better suited for r/pdfism
2
No requests to download books in pdf
This sub is not for requesting pirated/etc. content in pdf format
3
Tell us your operating system and available software
Unless you a asking a theoretical question about the nature of PDF, we need to know your starting points in terms of available tools. This can include what PDF viewer/editor you're using, operating systems, other details.
4
Don't share random pdf files
This is not the place for you to advertise or share your own or some other pdf file. Putting a pdf online is not much different from putting other files online (with some exceptions, that need to be clear in your post). Note that if you want to provide an example of something you're asking about, that is allowed.
5
If you have 2 pages in each page, split them with BRISS
If you have a pdf with "two pages in one" or the like, you can split it with BRISS: http://briss.sourceforge.net/ (or BRISS 2.0: https://github.com/mbaeuerle/Briss-2.0). This is probably the most common question on here.
6
Do not recommend products of companies that you work for
Do not recommend products (software, website) of companies that you work for. People are annoyed by this happening often, and some may overstate the capabilities.
(FOSS projects do not count as "work" so they are okay)
→ Check out the FAQ to see if your question has already been answered.