Where can I find a good place to obtain philosophy articles, journals, and books for free?
Due to copyright there is no place where you can legally obtain contemporary papers and books if the manuscripts are not made accessible by the authors themselves (like on academia.edu or PhilArchive).
The common legal places are found in the first comment to the question by @Conifold (copied for archiving-purposes. Comments can be deleted fast):
You want everything in one place, don't you. PhilArchive, formerly PhilPapers, is an online repository of philosophy e-prints, PhilSci-Archive is similar, but specializes in philosophy of science. Internet Archive and Project Gutenberg have free books of all sorts, mostly older ones, including many on philosophy. They are searchable by keywords.
Another legal way is usually via huge libraries or university accounts. They commonly have contracts with different publishers of journals so that you can download papers for free (for personal/academic use!). Some publishers, like Oxford University Press, offer some books as download per chapter to these institutions as well.
If you are interested in a particular paper, sometimes writing an email to the author and simply asking for it helps. Most of them actually have no problem with sending a pdf of their papers.
Everything else violates copyrights and is simply illegal.
Project Gutenberg is great for anything 70 years older than when the author died. LibriVox have audio versions of public domain books.
A relatively recent addition to translations of Wittgenstein's work 'The Mythology Of Our Language: Remarks On Frazer's Golden Bough' is available for free download here.
Open Culture has philosophy resources.
You might be interested to read about Z Library, 'a shadow library and file-sharing project for scholarly journal articles, academic and general-interest', although I couldn't possibly recommend it (that is a Wikipedia link discussing the topic).
Visit your local library, and/or look up their online resources. There were already online services, & they have expanded in lockdown.
If you have interests in specific types of philosophy you may find additional resources.
Your local public library will have some philosophy books, and if you want extra you can often request a purchase for specific titles as long as they are relatively new publications. (This is good as it also supports your library and authors which in turn makes access easier).
For other books you can request ILLs (Interlibrary Loans) from your local library. They will often be able to bring in books from academic libraries for you.
You can inquire if your local library has partnerships with the local university which will in turn give you access to the academic library just as if you were a student there.
For articles, some academic libraries grant guest access to their databases where you can download articles, however they may require you to be onsite for that.