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SCP FOUNDATION LORE (NOT EVERYTHING)
The SCP Universe is where there exists many, many anomalies and phenomenon (SCPs) which are sought after by multiple organizations for different reasons. Some for their own benefit, others for the sake of protecting mankind. One very prominent example is the Foundation itself. The SCP "Secure, Contain, Protect" Foundation aims to protect mankind from harmful anomalies and maintain a state of normalcy within the masses. They refer to anything out of the norm as an SCP, and contain it or otherwise keep it obscured from the general public if containment isn't possible (for obvious reasons, such as to avoid panic).
There are currently 4999 SCPs listed on the wiki (by the time Series V is completed, at least.) And they range from a portal to a post-apocalyptic world devoid of human life to a huggable dog like mass of orange gelatin that makes you think 'hey you know what? life ain't so bad.' This variety leads to some very interesting stories that can all be read on the wiki. Yes, the SCP entries aren't everything the SCP universe has to offer. I am currently reading the canon titled "Resurrection," which, without spoiling anything revolves around a human SCP; a girl that can manipulate photographs, able to put her arm through them, that's it. She has this very specific, seemingly mundane 'superpower' and yet the authors of SCP have managed to give birth to a large collection of stories from it, showing just how creative the community can be.
The wiki is told in the eyes of the Foundation. It functions from the collaborative efforts of researchers, agents and human test subjects we call Class-D. This is the type of stuff you may be familiar with if you stumbled upon the SCP universe from games like SCP: Containment Breach or the one growing ever so popular SCP: Secret Laboratory. That's the type of stuff people are more interested in and is the aspect people think of the most. There are other groups however, such as the people who run the organization in the shadows. The O5 Council are responsible for everything. 13 individuals with classified identities, they make up the highest ranks and direct the priorities and missions of the Foundation. There are Mobile Task Forces, or MTF which is pretty straight forward, however unfortunately it's only the MTF Epsilon-11 or Nine Tailed Fox that actually gets recognition. There exist other Task Forces that specialize in other areas, and then there's my favourite, Task Force Nu-7, which is basically a full functioning military unit, with Tanks and airborne units operating under the Foundation (I find this much more interesting than the Nine Tailed Fox, but there just isn't any exposure for them).
These Task Forces also combat or oppose the aforementioned other organizations. One of the groups which I suppose you could label as the bad guys is the Chaos Insurgency. They go after SCPs, and take them by force if they have to. Their main purpose is weaponizing them, their ultimate motive however is unknown. Another popular Group of interest is the Global Occult Coalition. An organization rivalling the power and funding of the Foundation, but instead with the goal of destroying all that is abnormal to retain a state of normalcy. Their motive isn't as black and white, and even though they hate each other they sometimes even cooperate with the Foundation if they seek the same prize.
I tried to share my understanding of the SCP universe to the best of my ability, but again there's so much of the lore I haven't gotten to yet or stuff that goes really into depth that there's no point in going into. As long of an essay this was, there's more to the SCP Foundation I left out, so the best way to experience it is to read some of the stories yourself on the wiki. Another important thing that was mentioned by another user is that there is no canon, so anything you interpret as canon can be canon to you. I simply mentioned what was generally accepted by the community as "lore" but you can still choose to dismiss any of these if you disagree, but to answer your question I believe this was the best approach. Assuming you read up to here I hope this helped.